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Physik: Magnetische Funktionsmaterialien

List of Publications


138. Synthesis of Mg and Zn Diolates and their Use in Metal Oxide Deposition

Peter Frenzel, Andrea Preuß, Jörn Bankwitz, Colin Georgi, Fabian Ganss, Lutz Mertens, Stefan E. Schulz, Olav Hellwig, Michael Mehring and Heinrich Lang

RSC Adv. 9, 10657 (2019)

DOI: 10.1039/C9RA00585D


137. All-Optical Multipulse Pump-Probe Method for Selective Control of Magnetization Precessions in Magnetic Multilayers

Cassidy Berk, Fabian Ganss, Mike Jaris, Manfred Albrecht, and Holger Schmidt

IEEE J. Sel. Top. Quantum Electron. 25, 8800205 (2019)

DOI: 10.1109/JSTQE.2019.2899779


136. Control of domain structure and magnetization reversal in thick Co/Pt multilayers

L. Fallarino, A. Oelschlägel, J. A. Arregi, A. Bashkatov, F. Samad, B. Böhm, K. Chesnel, and O. Hellwig

Phys. Rev. B 99, 024431 (2019)

DOI: 10.1103/PhysRevB.99.024431



135. Morphological stripe-bubble transition in remanent magnetic domain patterns of Co/Pt multilayer films and its dependence on Co thickness

Karine Chesnel, Andrew S. Westover, Carson Richards, Brittni Newbold, Matthew Healey, Lauren Hindman, Berg Dodson, Kelsey Cardon, David Montealegre, Jeremy Metzner, Tobias Schneider, Benny Böhm, Fabian Samad, Lorenzo Fallarino and Olav Hellwig

Phys. Rev. B 98, 224404 (2018)

DOI: 10.1103/PhysRevB.98.224404


134. Ultrafast Self-Induced X-Ray Transparency and Loss of Magnetic Diffraction

Z. Chen, D. J. Higley, M. Beye, M. Hantschmann, V. Mehta, O. Hellwig, A. Mitra, S. Bonetti, M. Bucher, S. Carron, T. Chase, E. Jal, R. Kukreja, T. Liu, A. H. Reid, G. L. Dakovski, A. Föhlisch, W. F. Schlotter, H. A. Dürr, and J. Stöhr

Phys. Rev. Lett. 121, 137403 (2018)

DOI: 10.1103/PhysRevLett.121.137403


133. Ultrafast laser generated strain in granular and continuous FePt thin films

A. von Reppert, L. Willig, J.-E. Pudell, M. Rössle, W. Leitenberger, M. Herzog, F. Ganss, O. Hellwig, and M. Bargheer

Appl. Phys. Lett. 113, 123101 (2018)

DOI: 10.1063/1.5050234


132. High-frequency measurements of thermophysical properties of thin films using a modified broad-band frequency domain thermoreflectance approach

Mohammadreza Shahzadeh, Mizanur Rahman, Olav Hellwig, and Simone Pisana

Review of Scientific Instruments 89, 084905 (2018)

DOI: 10.1063/1.5037117


131. Measuring the thermal properties of anisotropic materials using beam-offset frequency domain thermoreflectance

Mizanur Rahman, Mohammadreza Shahzadeh, Philipp Braeuninger-Weimer, Stephan Hofmann, Olav Hellwig, and Simone Pisana

Journal of Applied Physics 123, 245110 (2018)

DOI: 10.1063/1.5033966


130. Beyond a phenomenological description of magnetostriction

A. H. Reid, X. Shen, P. Maldonado, T. Chase, E. Jal, P. Granitzka1, K. Carva, R. K. Li, J. Li, L. Wu, T. Vecchione, T. Liu, Z. Chen, D.J. Higley, N. Hartmann, R. Coffee, J. Wu, G.L. Dakowski, W. Schlotter, H. Ohldag, Y.K. Takahashi, V. Mehta, O. Hellwig, A. Fry, Y. Zhu, J. Cao1, E.E. Fullerton1, J. Stöhr, P. M. Oppeneer, X.J. Wang, H.A. Dürr

Nature Communications 9, Article number: 388 (2018)

DOI: 10.1038/s41467-017-02730-7


129. All-optical measurement of interlayer exchange coupling in Fe/Pt/FePt thin films

C. Berk, F. Ganss, M. Jaris, M. Albrecht, and H. Schmidt

Appl. Phys. Lett. 112, 052401 (2018)

DOI: 10.1063/1.5004686



128. Thermally induced magnetic switching in bit-patterned media

B. Pfau, C. M. Günther, T. Hauet, S. Eisebitt, and O. Hellwig

J. Appl. Phys. 122, 043907 (2017)

DOI: 10.1063/1.4992808


127. Magnetic Switching in Granular FePt Layers Promoted by Near-Field Laser Enhancement

P. W. Granitzka, E. Jal, L. Le Guyader, M. Savoini, D. J. Higley, T. Liu, Z. Chen, T. Chase, H. Ohldag, G. L. Dakovski, W. F. Schlotter, S. Carron, M. C. Hoffman, A. X. Gray, P. Shafer, E. Arenholz, O. Hellwig, V. Mehta, Y. K. Takahashi, J. Wang, E. E. Fullerton, J. Stöhr, A. H. Reid, and H. A. Dürr

Nano Lett. 17, 2426 (2017)

DOI: 10.1021/acs.nanolett.7b00052


126. Magnonic band structure in a Co/Pd stripe domain system investigated by Brillouin light scattering and micromagnetic simulations

C. Banerjee, P. Gruszecki, J. W. Klos, O. Hellwig, M. Krawczyk, and A. Barman

Phys. Rev. B 96, 024421 (2017)

DOI: 10.1103/PhysRevB.96.024421


125. Double exchange bias in ferrimagnetic heterostructures

B. Hebler, P. Reinhardt, G. L. Katona, O. Hellwig, and M. Albrecht

Phys. Rev. B 95, 104410 (2017)

DOI: 10.1103/PhysRevB.95.104410


124. Model-based magnetization retrieval from holographic phase images

Falk Röder, Karin Vogel, Daniel Wolf, Olav Hellwig, Sung Hun Wee, Sebastian Wicht, and Bernd Rellinghaus

Ultramicroscopy 176, 177 (2017)

DOI: 10.1016/j.ultramic.2016.11.003



123. Accumulative magnetic switching of ultra-high-density recording media by circularly polarized light

Y.K. Takahashi, R. Medapalli, S. Kasai, J. Wang, K. Ishioka, S.H. Wee, O. Hellwig, K. Hono, and E.E. Fullerton

Physical Review Applied 6, 054004 (2016)

DOI: 10.1103/PhysRevApplied.6.054004


122. Influence of crystallographic structure on the thermal conductivity of FePt thin films

Ashutosh Giri, Sung Hun Wee, Olav Hellwig, and Patrick E. Hopkins

Scientific Reports 6 (2016) 32077,

DOI: 10.1038/srep32077


121. Helicity and field dependent magnetization dynamics of ferromagnetic Co/Pt


Yu. Tsema, G. Kichin, O. Hellwig, V. Metha, A. V. Kimel, A. Kirilyuk, and Th. Rasing

Appl. Phys. Lett. 109 (2016) 072405.

DOI: 10.1063/1.4961246


120. Elimination of X-Ray Diffraction through Stimulated X-Ray Transmission

B. Wu, T. Wang, C. E. Graves, D. Zhu, W. F. Schlotter, J. J. Turner, O. Hellwig, Z. Chen,

H. A. Dürr, A. Scherz, and J. Stöhr

Phys. Rev. Lett. 117 (2016) 027401.

DOI: 10.1103/PhysRevLett.117.027401


119. Atomic resolution strain analysis in highly textured FePt thin films

S. Wicht, S. H. Wee, O. Hellwig, V. Mehta, S. Jain, D. Weller, and B. Rellinghaus

J. Appl. Phys. 119 (2016) 115301.

DOI: 10.1063/1.4943936


118. Enhancement of magnetic domain topologies in Co/Pt thin films by fine tuning the magnetic field path through out the hysteresis loop

Andrew S.Westover, Karine Chesnel, Kelsey Hatch, Philip Salter, Olav Hellwig

J. Magn. Magn. Mater. 399 (2016) 164.

DOI: 10.1016/j.jmmm.2015.09.040



117. Bit Patterned Magnetic Recording:  Theory, Media Fabrication, and Recording Performance

Thomas R. ALBRECHT, Hitesh ARORA, Vipin AYANOOR-VITIKKATE, Jean-Marc BEAUJOUR, Daniel BEDAU, David BERMAN, Alexei L. BOGDANOV, Yves-Andre CHAPUIS, Julia CUSHEN, Elizabeth E. DOBISZ, Gregory DOERK, He GAO, Michael GROBIS, Bruce GURNEY, Fellow, IEEE, Weldon HANSON, Olav HELLWIG, Toshiki HIRANO, Jeffrey LILLE, Pierre-Olivier JUBERT, Dan KERCHER, Zuwei LIU, C. Mathew MATE, Iouri OBOUKHOV, Kanaiyalal C. PATEL, Kurt RUBIN, Ricardo RUIZ, Manfred SCHABES, Lei WAN, Dieter WELLER, Tsai-Wei WU, and En YANG

IEEE Trans. Magn. 51 (2015) 0800342.

DOI: 10.1109/TMAG.2015.2397880


116. Extracting magnetic cluster size and its distributions in advanced perpendicular recording media with shrinking grain size using small angle x-ray scattering

Virat Mehta, Tianhan Wang, Yoshihiro Ikeda, Ken Takano, Bruce D. Terris, Benny Wu, Catherine Graves, Michael Shu, Andreas Scherz, Jo Stöhr and Olav Hellwig

Appl. Phys. Lett. 106 , (2015) 202403.

DOI: 10.1063/1.4921403


115. Curie temperature distribution in FePt granular media

Simone Pisana, Shikha Jain, James W. Reiner, Oleksandr Mosendz, Gregory J. Parker, Matteo Staffaroni, Olav Hellwig, and Barry C. Stipe

IEEE Trans. Magn. 51 (2015) 3200205 (TMRC proceeding).

DOI: 10.1063/1.4873543


114. Modification of the structural and magnetic properties of granular FePt films by seed layer conditioning

S. Wicht, V. Neu, L. Schultz, V. Mehta, S. Jain, J. Reiner, O. Mosendz,  O. Hellwig, D. Weller, and B. Rellinghaus

J. Appl. Phys. 117 (2015) 013907.



113. Optically Induced Spin Wave Dynamics in [Co/Pd]8 Antidot Lattices with Perpendicular Magnetic Anisotropy

S. Pal, J. W. Klos, K. Das, O. Hellwig, P. Gruszecki, M. Krawczyk, and A. Barman

Appl. Phys. Lett. 105 (2014) 162408.

DOI: 10.1063/1.4898774


112. Influence of stray fields on the switching-field distribution for bit-patterned media based on pre-patterned substrates

B. Pfau, C. M. Günther, E. Guehrs, T. Hauet, T. Hennen, S. Eisebitt, and O. Hellwig

Appl. Phys. Lett. 105 (2014) 132407.

DOI: 10.1063/1.4896982


111. Bit Patterned Media Optimization at 1 Tdot/in2 by Post-Annealing

Olav Hellwig, Ernesto E. Mariners, Dan Kescher, Tyler Hennen, Andrew McCallum, Elizabeth Dobisz, Tsai-Wei Wu, Jeff Lille, Toshiki Hirano, Ricardo Ruiz, Michael K. Grobis, Dieter Weller and Thomas R. Albrecht

J. Appl. Phys. 116 (2014) 123913.

DOI: 10.1063/1.4896667


110. Measurement of the Curie temperature Distribution in FePt granular magnetic  media

S. Pisana, S. Jain, J. W. Reiner, G. J. Parker, C. C. Poon, O. Hellwig, and B. C. Stipe

Appl. Phys. Lett. 104 (2014) 162407.

DOI: 10.1063/1.4873543


109. Influence of magnetic domain size on dipolar interactions and hysteresis field asymmetry in layered high/low coercivity perpendicular anisotropy systems

Thomas Hauet and Olav Hellwig, J. Appl. Phys. 115 (2014) 123911.

DOI: 10.1063/1.4870136


108. Effect of the Spin-Twist Structure on the Spin-Wave Dynamics of the Fe55Pt45/Ni80Fe20 Exchange Coupled Bilayers with varying Ni80Fe20 thicknesses

Semanti Pal, Saswati Barman, Olav Hellwig, Anjan Barman

J. Appl. Phys. 115 (2014) 17D105.

DOI: 10.1063/1.4855015



107. Magnetic design evolution in perpendicular magnetic recording media as revealed by resonant small angle x-ray scattering

Tianhan Wang, Virat Mehta, Yoshihiro Ikeda, Hoa Do, Kentaro Takano, Sylvia Florez,

Bruce D. Terris, Benny Wu, Catherine Graves, Michael Shu, Ramon Rick, Andreas Scherz, Joachim Stohr, and Olav Hellwig

Appl. Phys. Lett. 103 (2013) 112403.

DOI: 10.1063/1.4820921


106. Influence of structural disorder on magnetic domain formation in perpendicular anisotropy thin films

M. S. Pierce, J. E. Davies, J. J. Turner, K. Chesnel, E. E. Fullerton, J. Nam, R. Hailstone, S. D. Kevan, J. B. Kortright, Kai Liu, L. B. Sorensen, B. R. York, and O. Hellwig

Phys. Rev. B 87 (2013) 184428.

DOI: 10.1103/PhysRevB.87.184428


105. Stoner enhanced paramagnetic influence on superconductivity in a superconductor/metallic heterostructure

S. J. Ray, S.J. Lister, S.L. Lee, O. Hellwig, J. Stahn

Physica C 487 (2013) 67.

DOI: 10.1016/j.physc.2013.01.019


104. Bit Patterned Media at 1 Tdot/in2 and Beyond

Thomas R. Albrecht, Daniel Bedau, Elizabeth Dobisz, He Gao, Michael Grobis, Olav Hellwig, Dan Kercher, Jeffrey Lille, Ernesto Marinero, Kanaiyalal Patel, Ricardo Ruiz, Manfred E. Schabes, Lei Wan, Dieter Weller, and Tsai-Wei Wu

IEEE Trans. Magn. 49 (2013) 773 (TMRC 2012 proceeding)

DOI: 10.1109/TMAG.2012.2227303



103. Diamondoid coating enables disruptive approach for chemical and magnetic imaging with 10 nm spatial resolution

Hitoshi Ishiwata, Yves Acremann, Andreas Scholl, Eli Rotenberg, Olav Hellwig, Elizabeth Dobisz, Andrew Doran, Boryslav A. Tkachenko, Andrey A. Fokin, Peter R. Schreiner, Jeremy E.P. Dahl, Robert M. K. Carlson, Nick Melosh, Zhi-Xun. Shen and Hendrik Ohldag

Appl. Phys. Lett. 101 (2012) 163101.

DOI: 10.1063/1.4756893


102. Fabrication of 1 Teradot/in2 CoCrPt bit patterned media and recording

performance with a conventional read/write head

Elizabeth A. Dobisz, Dan Kercher, Michael Grobis, Olav Hellwig, Ernesto E. Marinero,

Dieter Weller, and Thomas R. Albrecht

Journal of Vacuum Science Technology B (30)6.

DOI: 10.1116/1.4757955


101. Rapid preparation of electron beam induced deposition Co MFM tips with 10 nm spatial resolution

L. Belova, O. Hellwig, E. Dobisz, E. D. Dahlberg

Review of Scientific Instruments 83 (2012) 093711.

DOI: 10.1063/1.4752225


100. Modifications of magnetic anisotropy and magnetization reversal in [Co0.4nm/Pd0.7nm]50 multilayers induced by 10 keV-He ion bombardment

Arno Ehresmann, Olav Hellwig, Oliver Buhl, Nicolas David Müglich, Tanja Weis, and Dieter Engel,

J. Appl. Phys. 112 (2012) 063901.

DOI: 10.1063/1.4752274


99. Prevention of dewetting during annealing of FePt films for bit patterned media applications

A. T. McCallum, J. Lille, D. Weller and O. Hellwig

Appl. Phys. Lett. 101 (2012) 092402.

DOI: 10.1063/1.4748162


98. Femtosecond Single-shot Imaging of Nanoscale Ferromagnetic Order in Co/Pd Multilayers Using Resonant X-Ray Holography

Tianhan Wang, Diling Zhu, Benny Wu, Catherine Graves, Stefan Schaffert, Torbjoern Rander, Leonard Mueller, Boris Vodungbo, Cedric Baumier, David P. Bernstein, Bjoern Braeuer, Vincent Cros, Sanne De Jong, Renauld Delaunay, Andreas Fognini, Roopali Kukreja, Sooheyong Lee, Victor-Lopez-Flores, Jyoti Mohanty, Bastian Pfau, Horia Popescu, Maurizio Sacchi, Anna B. Sardinha, Marc Messerschmidt, Joshua J. Turner, William F. Schlotter, Olav Hellwig, Yves Acremann, Christian Gutt, Jean Yves Bigot, Hermann Duerr, Christine Boeglin, Joachim Stoehr, Eric Beaurepaire, Stefan Eisebitt, Gerhard Gruebel, Jan Luening, Joachim Stohr and Andreas Scherz

Phys. Rev. Lett. 108 (2012) 267403.

DOI: 10.1103/PhysRevLett.108.267403


97. Time-resolved measurement of spin-wave spectra in CoO capped [Co(t)/Pt(7Å)]n-1 Co(t) multilayer systems

S. Pal, B. Rana, S. Saha, R. Mandal, O. Hellwig, J. Romero-Vivas, S. Mamica, J. W. Klos, M. Mruczkiewicz, M. L. Sokolovskyy, M. Krawczyk, and A. Barman

J. Appl. Phys. 111 (2012) 07C507.

DOI: 10.1063/1.3672857


96. Generation and Control of Ultrashort-Wavelength 2D Surface Acoustic Waves at nanoscale interfaces

Qing Li, Kathleen Hoogeboom-Pot, Damiano Nardi, Margaret M. Murnane, Henry C. Kapteyn, Mark E. Siemens, Erik H. Anderson, Olav Hellwig, Elizabeth Dobisz and Bruce Gurney, Ronggui Yang and Keith A. Nelson

Phys. Rev. B 85, (2012) 195431.

DOI: 10.1103/PhysRevB.85.195431



95. L10  FePtCu bit patterned media

C. Brombacher, M. Grobis, J. Lee, J. Fidler, T. Eriksson, T. Werner, O. Hellwig, and M. Albrecht,

Nanotechnology 23 (2011) 025301.

DOI: 10.1088/0957-4484/23/2/025301


94. Observation of Laser Induced Magnetization Dynamics in Co/Pd Multilayers with Coherent X-ray Scattering

B. Wu, D. Zhu, Y. Acremann, T.A. Miller, A.M. Lindenberg, O. Hellwig, J. Stohr, and A. Scherz,

Appl. Phys. Lett. 99 (2011) 252505.

DOI: 10.1063/1.3670305


93. Impact of Out-of-Plane Translational Order in Block Copolymer Lithography

Joan K. Bosworth, Olav Hellwig, Elizabeth Dobisz, Ricardo Ruiz

Macromolecules, 44 (23), (2011) 9196.

DOI: DOI: 10.1109/TMAG.2011.2155630


91. Magnetic ground and remanent states of synthetic metamagnets with perpendicular anisotropy

N. S. Kiselev, U. K. Roeßler, A. N. Bogdanov and O. Hellwig

J. Phys.: Conf. Ser. 303 (2011) 012051.

DOI: 10.1088/1742-6596/303/1/012051


90. Origin of magnetic switching field distribution in bit patterned media based on pre-patterned substrates

B. Pfau, C. M. Günther, E. Guehrs, T. Hauet, E. Dobisz, D. Kercher, H. Yang, L. Vinh, X. Xu, D. Yaney,  R. L. Rick, S. Eisebitt, and O. Hellwig,

Appl. Phys. Lett. 99 (2011) 062502.

DOI: 10.1063/1.3623488


89. Tuning the magnetic properties of Co nanoparticles by Pt capping

A. Ebbing, O. Hellwig, L. Agudo, G. Eggeler, and O. Petracic,

Phys. Rev. B 84 (2011) 012405.

DOI: 10.1103/PhysRevB.84.012405


88. L10 FePt Based Exchange Coupled Composite Bit Patterned Films

A. T. McCallum, P. Krone, F. Springer, C. Brombacher, M. Albrecht, E. Dobisz, M. Grobis, D. Weller and O. Hellwig,

Appl. Phys. Lett. 98 (2011) 242503.

DOI: 10.1063/1.3599573


87. Recording Study on Percolated Perpendicular Media

Michael Grobis, Carsten Schulze, Marco Faustini, David Grosso, Olav Hellwig, Denys Makarov, and Manfred Albrecht

Appl. Phys. Lett. 98 (2011) 192504.

DOI: 10.1063/1.3587635


86. Influence of ion irradiation on switching field and switching field distribution in arrays of Co/Pd-based bit pattern media

T. Hauet, O. Hellwig, S.-H. Park, C. Beigné, B. D. Terris, and D. Ravelosona

Appl. Phys. Lett. 98 (2011) 172506.

DOI: 10.1063/1.3581896


85. Ferrimagnetic stripe domain formation in antiferromagnetically-coupled Co/Pt-Co/Ni-Co/Pt multilayers studied via soft x-ray techniques

O. Hellwig, C. M. Günther, F. Radu, A. Menzel, W. F. Schlotter, J. Lüning and S. Eisebitt

Appl. Phys. Lett. 98 (2011) 172503.

DOI: 10.1063/1.3583454


84. Probing the time-dependent switching probability of individual patterned magnetic islands

F. Springer, O. Hellwig, E. Dobisz, M. Albrecht, and M. Grobis

J. Appl. Phys. 109 (2011) 07B905.

DOI: 10.1063/1.3540574


83. Anisotropy Measurements of FePt Thin Films

H. J. Richter, O. Hellwig, S. Florez, C. Brombacher, and M. Albrecht

J. Appl. Phys. 109 (2011) 07B713.

DOI: 10.1063/1.3536459


82. Tunable magnonic frequency and damping in [Co/Pd]8 multilayers with variable Co layer thickness

S. Pal, B. Rana, O. Hellwig, T. Thomson, and A. Barman

Appl. Phys. Lett. 98 (2011) 082501.

DOI: 10.1063/1.3559222


81. Thickness dependent magnetization dynamics of perpendicular anisotropy Co/Pd multilayer films

Z. Liu, R. Brandt, O. Hellwig, S. Florez, T. Thomson, B. Terris, and H. Schmidt

J. Magn. Magn. Mater. 323 (2011) 1623.

DOI: 10.1016/j.jmmm.2011.01.025


80. High-Density Bit Patterned Media: Magnetic Design and Recording Performance

Michael Grobis, Olav Hellwig, Thomas Hauet, Elizabeth Dobisz, and Thomas R. Albrecht

IEEE Transactions on Magnetics, Vol. 47, No. 1, (2011) 6.

DOI: 10.1109/TMAG.2010.2076798



79. Exchange Bias and Domain Evolution at 10 nm Scales

I. Schmid, M.A. Marioni, P. Kappenberger, S. Romer, M. Parlinska, and H.J. Hug, O. Hellwig, M.J.Carey, and E.E. Fullerton,

Phys. Rev. Lett. 105 (2010) 197201.

DOI: 10.1103/PhysRevLett.105.197201


78. Intrinsic defects in perpendicularly magnetized multilayer thin films and nanostructures

Justin M. Shaw, Miles Olsen, June Lau, Michael L. Schneider, T.J. Silva, Olav Hellwig, Elizabeth Dobisz and Bruce D. Terris

Phys. Rev. B. 82 (2010) 144437.

DOI: 10.1103/PhysRevB.82.144437


77. Cumulative Minor Loop Growth in Co/Pt- and Co/Pd-Multilayers

A. Berger, S. Mangin, O. Hellwig, E. E. Fullerton

Phys. Rev. B 82 (2010) 104423.

DOI: 10.1103/PhysRevB.82.104423


76. Magnetic imaging at linearly polarized x-ray sources

B. Pfau, C. M. Günther, R. Könnecke, E. Gührs, O. Hellwig, W. F. Schlotter, and S. Eisebitt

Optics Express, Vol. 18, Issue 13, (2010) 13608.

DOI: 10.1364/OE.18.013608


75. Magnetic recording at 1.5 Pb/m2 using an integrated plasmonic antenna

B. C. Stipe, T. Strand, C. Poon, H. Balamane, T. Boone, J. Katine, J-L Li, V. Rawat, H. Nemoto, A. Hirotsune, O. Hellwig, R. Ruiz, E. Dobisz, N. Robertson, T. Albrecht, and B. D. Terris, Nature Photonics 4, (2010) 484 – 488.

DOI: 10.1038/nphoton.2010.90


74. Microscopic Reversal Behavior of Magnetically Capped Nanospheres

C.M. Günther, O. Hellwig, A. Menzel, B. Pfau, F. Radu, D. Makarov, M. Albrecht, W.F.

Schlotter, R. Ramon, J. Lüning, and S. Eisebitt, Phys. Rev. B. 81 (2010) 064411.

DOI: 10.1103/PhysRevB.81.064411


73. Effect of Magnetic Coupling on the Magnetization Reversal in Arrays of Magnetic Nanocaps

T.C. Ulbrich, C. Bran, D. Makarov, O. Hellwig, J.D. Risner-Jamtgaard, D. Yaney, H. Rohrmann, V. Neu, and M. Albrecht, Phys. Rev B. 81, (2010) 054421.

DOI: 10.1103/PhysRevB.81.054421


72. Influence of growth morphology on the Néel temperature of CrRu thin films and heterostructures

A. R. E. Prinsloo, H. A. Derrett, O. Hellwig, E. E. Fullerton, H. L. Alberts and N. van den Berg, J. Magn. Magn. Mater. 322 (2010) 1126.

DOI: 10.1016/j.jmmm.2009.07.063


71. Topological defect in antiferromagnetically coupled multilayers with perpendicular anisotropy

N. S. Kiselev, U. K. Roessler, A. N. Bogdanov and O. Hellwig,

Appl. Phys. Lett. 93, 162502 (2008)

DOI: 10.1063/1.2993328


70. Bit patterned media based on e-beam directed assembly with narrow magnetic switching field distribution

O. Hellwig,  J. K. Bosworth, E. Dobisz, D. Kercher T. Hauet, G. Zeltzer, J. D. Risner-Jamtgaard, D. Yaney, and R. Ruiz, Appl. Phys. Lett., 96 (2010) 052511.

DOI: 10.1063/1.3293301


69. Metamagnetic domains in antiferromagnetically coupled multilayers with

perpendicular anisotropy

N. S. Kiselev, C. Bran, U. Wolff, L. Schultz, A. N. Bogdanov, O. Hellwig, V. Neu, and U. K. Roessler, Phys. Rev. B. 81 (2010) 054409.

DOI: 10.1103/PhysRevB.81.054409


68. Measurements of the write error rate in bit patterned magnetic recording at 100-300 Gb/in2

M. Grobis, E. Dobisz, O. Hellwig, M. Schabes, T. Hauet, G. Zeltzer, and T. Albrecht,

Appl. Phys. Lett. 96 (2010) 052509.

DOI: 10.1063/1.3304166



67. Role of reversal incoherency in reducing switching field and switching field distribution of exchange coupled composite bit patterned media

T. Hauet, E. Dobisz, S. Florez, J. Park, B. Lengsfield, B.D. Terris and O. Hellwig

Appl. Phys. Lett. 95 (2009) 262504.

DOI: 10.1063/1.3276911


66. Coercivity Tuning in Co/Pd Multilayer Based Bit Patterned Media

O. Hellwig, T. Hauet, T. Thomson, E. Dobisz, J. D. Risner-Jamtgaard, D. Yaney, B. D. Terris and E. E. Fullerton, Appl. Phys. Lett. 95 (2009) 232505.

DOI: 10.1063/1.3271679


65. Revealing the reversible rotation of magnetization in Exchange-Coupled Composite media switching

T. Hauet, S. Florez, D. Margulies, Y. Ikeda, B. Lengsfield, N. Supper, K. Takano, O. Hellwig, and B.D. Terris,

Appl. Phys. Lett. 95 (2009) 222507.

DOI: 10.1063/1.3270535


64. Suppression of the perpendicular anisotropy at the CoO Néel temperature in exchange-biased CoO/[Co/Pt] multilayers

E. Shipton, K. Chan, T. Hauet, O.Hellwig and E. E. Fullerton

Appl. Phys. Lett. 95 (2009) 132509.

DOI: 10.1063/1.3240402


63. Frustration driven stripe domain formation in Co/Pt multilayer films

J. E. Davies, O. Hellwig, E. E. Fullerton, M. Winklhofer, A. D. Shull and K. Liu,

Appl. Phys. Lett. 95 (2009) 022505.

DOI: 10.1063/1.3179553


62. Resonant magnetic scattering with soft x-ray pulses from a free electron laser operating at 1.59 nm

C. Gutt, L.-M. Stadler, S. Streit-Nierobisch, A. Mancuso, A. Schropp, J. Gulden, B. Reime, J. Feldhaus, E. Weckert, I. Vartaniants, B. Pfau, C.M. Günther, R. Könnecke, S. Eisebitt, O. Hellwig, F. Staier, A. Rosenhahn, D. Stickler, H. Stillrich, R. Frömter, H.P. Oepen, M. Martins, T. Nisius, T. Wilhein, A. Brenger, B. Faatz, N. Guerassimova, K. Honkavaara, R. Treusch, E. Saldin, S. Schreiber, E.A. Schneidmiller, M.V. Yurkov, and G. Grübel,

Phys. Rev. B 79 (2009) 212406.

DOI: 10.1103/PhysRevB.79.212406


61. Evolution of stripe and bubble domains in antiferromagnetically coupled [Co/Pt]/Ru multilayers

Cristina Bran, Anna B. Butenko, Nikolai S. Kislev, Ulrike Wolff, Ludwig Schultz, Olav Hellwig, Ulrich K. Roessler, Alexei N. Bogdanov, and Volker Neu

Phys. Rev. B 79 (2009) 024430.

DOI: 10.1103/PhysRevB.79.024430



60. Suppression of Magnetic Trench Material in Bit Patterned Media Fabricated by Blanket Deposition onto Pre-patterned Substrates

O. Hellwig, A. Moser, E. Dobisz, Z. Bandic, H. Yang, D. S. Kercher, J. D. Risner-Jamtgaard, D. Yaney and E. E. Fullerton

Appl. Phys. Lett. 93 (2008) 192501.

DOI: 10.1063/1.3013857


59. Evidence for a dynamic phase transition in [Co/Pt]3 magnetic multilayers

D. T. Robb, X. H. Xu, O. Hellwig, A. Berger, M. A. Novotny, P. A. Rikvold

Phys. Rev. B 78, 134422 (2008).

DOI: 10.1103/PhysRevB.78.134422


58. Topological defects in antiferromagnetically coupled multilayers with perpendicular anisotropy

N. S. Kiselev U. K. Roessler, A. N. Bogdanov, and O. Hellwig

Appl. Phys. Lett. 93 (2008) 162502.

DOI: 10.1063/1.2993328


57. Magnetic coupling in Gd/Ni bilayers

A. Barth, F. Treubel, M. Marszalek, W. Evenson, O. Hellwig, C. Borschel, M. Albrecht, G. Schatz,

J. Phys.: Condensed Matter 20 (2008) 395232.

DOI: 10.1088/0953-8984/20/39/395232


56. Step-like versus Continuous Domain Propagation in Co/Pd-Multilayer Films

C. M. Günther, F. Radu, A. Menzel, S. Eisebitt, W. F. Schlotter, J. Lüning, J. Stöhr, and O. Hellwig

Appl. Phys. Lett. 93, 072505 (2008).

DOI: 10.1063/1.2968305


55. Reversal mechanisms in perpendicularly magnetized nanostructures

Justin M. Shaw, Stephen E. Russek, Thomas Thomson, Michael J. Donahue, Bruce D. Terris, Olav Hellwig, Elizabeth Dobisz and Michael L. Schneider

Phys. Rev. B 78, 024414 (2008).

DOI: 10.1103/PhysRevB.78.024414


54. Field driven ferromagnetic phase evolution originating from the domain boundaries in antiferromagnetically coupled perpendicular anisotropy films

T. Hauet, C. Günther, O. Hovorka, A. Berger, M.-Y. Im, P. Fischer, T. Eimueller and O. Hellwig,

Appl. Phys. Lett. 93, 042505 (2008).

DOI: 10.1063/1.2961001


53. Engineering  a magnetic system with antiferromagnetic-to-ferromagnetic phase transition based on Co/Pd multilayers

Jan-Ulrich Thiele, Thomas Hauet and Olav Hellwig,

Appl. Phys. Lett. 92 (2008) 242502.

DOI: 10.1063/1.2946654


52. Direct observation of field and temperature induced domain replication in dipolar coupled perpendicular anisotropy films

T. Hauet, C. Günther, B. Pfau, M. Schabes, S. Eisebitt, P. Fischer, R.L. Rick and O. Hellwig,

Phys. Rev. B 77 (2008) 184421.

DOI: 10.1103/PhysRevB.77.184421


51. Oxidation of epitaxial Y(0001) films via evolution of laterally heterogeneous oxidation channels along defect lines

M. Ay, O. Hellwig, H.W. Becker, B. Hjörvarsson and H. Zabel,

Applied Surface Science 254 (2008) 3184.

DOI: 10.1016/j.apsusc.2007.10.093


50. Temperature Dependent Magnetization Reversal of Perpendicular AF-coupled (Co/Pt)/Ru Multilayers

J. E. Davies, O. Hellwig, E. E. Fullerton, and K. Liu,

Phys. Rev. B 77 (2008) 014421.

DOI: 10.1103/PhysRevB.77.014421


49. The Role of Uncompensated Spins in Exchange Biasing

I. Schmid, P. Kappenberger, O. Hellwig, M. J. Carey, E. E. Fullerton and H. J. Hug,

Europhysics Letters, 81 (2008) 17001.

DOI: 10.1209/0295-5075/81/17001



48. Phase Imaging of Magnetic Nanostructures with Soft X-ray Spectro-Holography

A. Scherz, W. F. Schlotter, K. Chen, R. Rick, J. Stoehr, J. Luening, S. Eisebitt, Ch. Guenther, F. Radu, W. Eberhardt, O. Hellwig, and I. McNulty,

Phys. Rev. B 76 (2007) 214410.

DOI: 10.1103/PhysRevB.76.214410


47. Extended Field of View Soft X-ray Fourier Transform Holography: Towards Imaging Ultrafast Evolution in a Single Shot

W. F. Schlotter, J. Lüning, R. Rick, K. Chen, A. Scherz, S. Eisebitt, Ch. Günther, W. Eberhardt, O. Hellwig and J. Stöhr,

Optics Letters 32 (2007) 3110.

DOI: 10.1364/OL.32.003110


46. Off-track margin in bit patterned media

A. Moser, O. Hellwig, D. Kercher, and E. Dobisz,

Appl. Phys. Lett. 91 (2007) 162502.

DOI: 10.1063/1.2799174


45. Magnetic multilayers on nanospheres: Scaling of perpendicular exchange bias

L. Guhr, O. Hellwig, Ch. Brombacher and M. Albrecht,

Phys. Rev. B 76 (2007) 064434.

DOI: 10.1103/PhysRevB.76.064434


44. Magnetic Reversal in Antiferromagnetically Coupled Perpendicular Films

O. Hellwig, J. B. Kortright, A. Berger and E. E. Fullerton

J. Magn. Magn. Mater. 319 (2007) 13.

DOI: 10.1016/j.jmmm.2007.04.035


43. Investigation of Magnetization Reversal in Exchange Biased Nanocap Arrays

I. L. Guhr, S. van Dijken, G. Malinowski, P. Fischer, F. Springer, O. Hellwig and M. Albrecht

J. Phys. D: Appl. Phys. 40 (2007) 3005.

DOI: 10.1088/0022-3727/40/10/S02


42. Separating dipolar broadening from the intrinsic SFD in patterned media

O. Hellwig, A. Berger, T. Thomson, E. Dobisz , H. Yang, Z. Bandic, D. Kercher and E. E. Fullerton,

Appl. Phys. Lett. 90 (2007) 162516.

DOI: 10.1063/1.2730744


41. Magnetic phase separation in artificial A-type antiferromagnetic films

O. Hellwig, A. Berger and E. E. Fullerton,

Phys. Rev. B 75 (2007) 134416.

DOI: 10.1103/PhysRevB.75.134416


40. Disorder-Induced Magnetic Memory: Experiments and Theory

M. S. Pierce, C. R. Buechler, L. B. Sorensen, S. D. Kevan, E. A. Jagla, J. M. Deutsch, T. Mai, O. Narayan, J. E. Davies, K. Liu, G. T. Zimanyi, H. G. Katzgraber, O. Hellwig and E. E. Fullerton, P. Fischer and J. B. Kortright,

Phys. Rev. B 75 (2007) 144406.

DOI: 10.1103/PhysRevB.75.144406


39. Ultrafast magnetization dynamics in high perpendicular anisotropy [Co/Pt]n multilayers

A. Barman, S. Wang, O. Hellwig, A. Berger, E. E. Fullerton, H. Schmidt,

J. Appl. Phys. 101 (2007) 09D102.

DOI: 10.1063/1.2709502



38. Multiple Reference Fourier Transform Holography with Soft X-rays

W. F. Schlotter, R. Rick, K. Chen, A. Scherz, J. Stöhr, J. Lüning, S. Eisebitt, Ch. Günther, W. Eberhardt, O. Hellwig, and I. McNulty

Appl. Phys. Lett. 89 (2006) 163112.

DOI: 10.1063/1.2364259


37. Magnetic Imaging with Soft X-Ray Spectro-Holography

O. Hellwig, S. Eisebitt, W. Eberhardt, J. Lüning, W. F. Schlotter and J. Stöhr

J. Appl. Phys. 99 (2006) 08H307.

DOI: 10.1063/1.2165925



36. History Induced Critical Behavior in Disordered Systems

J. H. Carpenter, K. A. Dahme, A. C. Mills, M. B. Weissman, A. Berger and O. Hellwig

Phys. Rev. B 72 (2005) 052410.

DOI: 10.1103/PhysRevB.72.052410


35. Different Reversal Types in Exchange Spring Magnet Systems: Fe/SmCo versus FeNi/FePt

J. E. Davies, O. Hellwig, E. E. Fullerton, J. S. Jiang, S. D. Bader, G. T. Zimanyi and K. Liu

Appl. Phys. Lett. 80 (2005) 1234.

DOI: 10.1063/1.1954898  


34. Magnetic dot arrays with multiple storage layers

M. Albrecht, G. Hu, A. Moser, O. Hellwig and B. D. Terris

J. Appl. Phys. 97 (2005) 103910.

DOI: 10.1063/1.1904705


33. Magnetic Reversal and Domain Structure in Perpendicular AF-Coupled Films

O. Hellwig, A. Berger and E. E. Fullerton

J. Magn. Magn. Mater. 290-291 (2005) 1.

DOI: 10.1016/j.jmmm.2004.11.151


32. Interparticle Magnetic Correlations in Dense Co Nanoparticle Assemblies

J. B. Kortright, O. Hellwig, S. Sun and E. E. Fullerton

Phys. Rev. B 71 (2005) 012402.

DOI: 10.1103/PhysRevB.71.012402


31. Disorder-Induced Microscopic Magnetic Memory

M. S. Pierce, C. R. Buechler, L. B. Sorensen, J. J. Turner, S. D. Kevan, E. A. Jagla, J. M. Deutsch, T. Mai, K. Liu, J. Hunter Dunn, K. M. Chesnel, J. B. Kortright, O. Hellwig and E. E. Fullerton,

Phys. Rev. Lett. 94 (2005) 017202.

DOI: 10.1103/PhysRevLett.94.017202



30. Magnetization Reversal of Co/Pt Multilayers: Linking Macroscopic and Microscopic Level

J. E. Davies, O. Hellwig, E. E. Fullerton, G. Denbeaux, J. B. Kortright and K. Liu

Phys. Rev. B 70 (2004) 224434.

DOI: 10.1103/PhysRevB.70.224434


29. Lensless Imaging of Magnetic Nanostructures by X-ray Spectro-Holography

S. Eisebitt, J. Lüning, W. F. Schlotter, M. Lörgen, O. Hellwig, W. Eberhardt and J. Stöhr

Nature, 432 (2004) 885.

DOI: 10.1038/nature03139


28. Si-Doping of Co/Pd Multilayers for Improved Signal-to-Noise in Perpendicular Magnetic Recording Media

X. Qi, B. Stadler, R. Victora, J. Judy, O. Hellwig, and N. Supper

IEEE Transactions on Magnetics, Vol. 40, NO.4 (2004) 2476.

DOI: 10.1109/TMAG.2004.830430



27. Direct Imaging and Determination of the Uncompensated Spin Density in Exchange-Biased (Co/Pt)CoO Multilayers

P. Kappenberger, S. Martin, Y. Pellmont, H. J. Hug, J. B. Kortright, O. Hellwig and E. E. Fullerton

Phys. Rev. Lett. 91 (2003) 267202.

DOI: 10.1103/PhysRevLett.91.267202


26. Domain Walls in Antiferromagnetically Coupled Multilayer Films

O. Hellwig, A. Berger and E. E. Fullerton

Phys. Rev. Lett. 91 (2003) 197203.

DOI: 10.1103/PhysRevLett.91.197203


25. Polarization Effects in Coherent Scattering from Magnetic Specimen: Implications for X-ray Holography, Lensless Imaging, and Correlation Spectroscopy

S. Eisebitt, M. Lörgen, W. Eberhardt, J. Lüning, J. Stöhr, C. T. Rettner, O. Hellwig, E. E. Fullerton, and G. Denbeaux
Phys. Rev. B 68 (2003) 104419.

DOI: 10.1103/PhysRevB.68.104419


24. Magnetic X-ray Studies of Stripe Domains in Perpendicular Multilayers

O. Hellwig, G. Denbeau, J. B. Kortright and E. E. Fullerton

Physica B: Condensed Matter 336 (2003) 136.

DOI: 10.1016/S0921-4526(03)00282-5


23. Oxygen Ordering in Nb(110) Films

O. Hellwig and H. Zabel

Physica B: Condensed Matter 336 (2003) 90.

DOI: 10.1016/S0921-4526(03)00274-6


22. Soft X-ray Magnetic Scattering as a Probe of Recording Media

E. E. Fullerton , O. Hellwig, K. Takano and J. B. Kortright

NIM B 200 (2003) 202.

DOI: 10.1016/S0168-583X(02)01720-2


21. Magnetism in Heterogeneous Thin Film Systems: Resonant X-Ray Scattering Studies

J. B. Kortright, J. S. Jiang, S. D. Bader, O. Hellwig, D. T. Margulies, and E. E. Fullerton

NIM B 199, 301 (2003).

DOI: 10.1016/S0168-583X(02)01590-2


20. Tuning the Reversal of Antiferromagnetically Coupled Perpendicularly Magnetized Thin Films

O. Hellwig, T. L. Kirk, J. B. Kortright, A. Berger, and E. E. Fullerton

Nature Materials 2 (2003) 112.

DOI: 10.1038/nmat806


19. Quasielastic X-ray Speckle Metrology of Microscopic Magnetic Memory

M. Pierce, R. G. Moore, L. Sorensen, S. D. Kevan, J. B. Kortright, O. Hellwig and E. E. Fullerton

Phys. Rev. Lett. 90 (2003) 175502.

DOI: 10.1103/PhysRevLett.90.175502



18. Soft X-ray Characterization of Perpendicular Recording Media

E. E. Fullerton, O. Hellwig, Y. Ikeda, B. Lengsfield, K. Takano and J. B. Kortright

IEEE Trans. Mag. 38 (2002) 1693.

DOI: 10.1109/TMAG.2002.1017758


17. Coercivity Mechanisms in Positive Exchange Biased Co/Pt Multilayers

T. L. Kirk, O. Hellwig, and E. E. Fullerton

Phys. Rev. B 65 (2002) 224426.

DOI: 10.1103/PhysRevB.65.224426


16. Resolving Magnetic and Chemical Correlations in CoPtCr Films using Soft X-ray Scattering

J. B. Kortright, O. Hellwig, D. T. Margulies, and E. E. Fullerton

JMMM 240 (2002) 325.

DOI: 10.1016/S0304-8853(01)00787-9


15. Magnetic Reversal of Perpendicularly Biased Co/Pt Multilayers

O. Hellwig, S. Maat, J. B. Kortright, and E. E. Fullerton

Phys. Rev. B 65 (2002) 144418.

DOI: 10.1103/PhysRevB.65.144418


14. Role of B on Grain Sizes and Magnetic Correlation Length in Recording Media as Determined by Soft X-ray Scattering

O. Hellwig, J.B. Kortright, D.T. Margulies, B. Lengsfield, and E. E. Fullerton

Appl. Phys. Lett. 80 (2002) 1234.

DOI: 10.1063/1.1448665


13. Pinpointing Chiral Structures with front / back Polarized Neutron Reflectometry

K. V. O’Donovan, J. A. Borchers, C. F. Majkrzak, O. Hellwig and E. E. Fullerton

Phys. Rev. Lett. 88 (2002) 067201.

DOI: 10.1103/PhysRevLett.88.067201


12. Extracting Buried Twists with Polarized Neutron Reflectometry

K. V. O’Donovan, J. A. Borchers, C. F. Majkrzak, O. Hellwig, and E. E. Fullerton

Applied Physics A 74 (2002) 1544.

DOI: 10.1007/s003390201707



11. Ordered Oxygen Phases in Epitaxial Nb(110) Layers

O. Hellwig, H. W. Becker, H. Zabel

Phys. Rev. B 64 (2001) 233404.

DOI: 10.1103/PhysRevB.64.233404


10. Magnetic Patterning of Chemically-Ordered CrPt3 Films

O. Hellwig, D. Weller, A. J. Kellock, J. E. E. Baglin and E. E. Fullerton

Appl. Phys. Lett. 79, 8 (2001) 1151.

DOI: 10.1063/1.1394722


9. Antiferromagnetic Structure of FePt3 Films Studied by Neutron Scattering

S. Maat, O. Hellwig, G. Zeltzer, and E. E. Fullerton

Phys. Rev. B 63 (2001) 134426.

DOI: 10.1103/PhysRevB.63.134426



8. In-situ X-ray Studies of Oxide Formation on Epitaxial Metal Films

H. Zabel, A. Stierle, O. Hellwig, and T. Koll,

In “Exploration of Subsurface Phenomena by Particle Scattering”, ed. N.Q. Lam, C. A. Melendres, S. K. Sinha, International Advanced Studies Press, (2000).


7. Oxidation of Epitaxial Nb(110) Films on a-plane Sapphire Substrates: An X-ray Study

O. Hellwig, G. Song, H. W. Becker, A. Birkner und H. Zabel

Material Science and Engineering Technology  31, (2000) 856.

DOI: 10.1002/1521-4052(200009)31:9<856::AID-MAWE856>3.0.CO;2-P


6. The Switching Behavior of Fe55Pt45/ Ni80Fe20 Exchange-Spring Magnets Studied by Resonant Soft X-ray Magneto-Optical Kerr Effect

O. Hellwig, J. B. Kortright, K. Takano, E. E. Fullerton 

Phys. Rev. B 62 (2000) 11694.

DOI: 10.1103/PhysRevB.62.11694


5. Oxidation of Nb(110) Thin Films on Sapphire Substrates

O. Hellwig, H. Zabel

Physica B: Condensed Matter 283 (2000) 228.

DOI: 10.1016/S0921-4526(99)01969-9



4. Temperature and Thickness Dependent Epitaxial Relationship of Pd(111) on Cr(110)

O. Hellwig, K. Theis-Bröhl , G. Wilhelmi, H. Zabel,

Thin Solid Films 318 (1998) 201.

DOI: 10.1016/S0040-6090(97)01165-6


3. Growth of FCC(111) on BCC(110):  Influence of Growth and Annealing Temperature on Epitaxy and Surface Morphology for Pd on Cr

O. Hellwig, K. Theis-Bröhl , G. Wilhelmi, H. Zabel,

Surface Science 410 (1998) 362.

DOI: 10.1016/S0039-6028(98)00390-2


2. Growth of FCC(111) on BCC(110): New Type of Epitaxial Transition Observed for Pd on Cr

O. Hellwig, K. Theis-Bröhl, G. Wilhelmi, A. Stierle, H. Zabel,

Surface Science 398 (1998) 379.

DOI: 10.1016/S0039-6028(98)80043-5



1. Temperature and Thickness Dependent Nishiyama-Wassermann / Kurdjumov-Sachs Epitaxial Relationship of Pd on Cr

O. Hellwig, K. Theis-Bröhl, G. Wilhelmi, A. Stierle, H. Zabel

Proceedings book „ECASIA 97“, TC 07, (1997) John Wiley & Sons, Ltd., (1997), 943.