Magneto-Optical Spectroscopy
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Semiconductor Physics
MAGNETO-OPTICAL SPECTROSCOPY
MAGNETO-OPTICAL SPECTROSCOPY
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Magneto-optical properties of molecules: Paramagnetic and diamagnetic molecules can exhibit magneto-optical activity in the UV-vis spectral range. From MOKE spectra and spectroscopic ellipsometry data, the Voigt constant Q, which is a material parameter independent of the film thickness, can be extracted. Using Q, the magneto-optical effects like MOKE or Faraday effect can be calculated. For example, Tetramethoxy-phenylporphyrins (TMPPs) show magneto-optical activity at around 2 eV (Q-band) and 3 eV (B-band). These molecules were synthesized by the Inorganic Chemistry Group at the Chemnitz University of Technology. |
Magneto-optical properties of transition metal oxides: Cu2O is a diamagnetic material, which exhibits magneto-optical activity in the region of the excitonic transitions (Phys. Rev. B, 84 (2011) 195203). Based on the shape of the MOKE spectral features, information on the crystalline quality can be obtained even for nanometer thin films. (Microelectron. Engin., accepted, DOI: 10.1016/ j.mee.2012.10.023). The ALD films were produced at the Fraunhofer Institute ENAS. |
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Magneto-optical properties of transition metal oxides: Nickel ferrite (NiFe2O4) shows feature-rich magneto-optical activity throughout the UV-Vis spectral range. There are three types of electronic transitions in the material that show up as pronounced peaks in the MOKE spectrum: transitions between crystal field splitted d-orbitals (CF), inter-sublattice charge transfer transitions (ISCT) and intervalance charge transfer transitions (IVCT). MOKE-magnetometery measurements reveal the typical ferrimagnetic magnetization behavior of NiFe2O4 with a remanence of approx. 40% and a coercivity of only ±80 mT. The samples were prepared by spin coating from an aqueous precursor solution with subsequent annealing to 1000 °C in the labs of Assoc. Prof. Page (University of Oregon, Eugene, OR, USA).
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Characterization of heterostructures for molecular spintronics: Phthalocyanine molecules are promising candidates for thin film spintronic devices. Therefore, they have to be incorporated in organic-inorganic heterojunctions, i.e. contacted by ferromagnetic electrodes. In cooperation with the group of Prof. O. Schmidt at IFW Dresden we use the technique of rolled-up nanomembranes for sandwiching a layer of cobalt pthalocyanine (CoPc) in between a permalloy (Py) bottom and a nickel top contact. The roll-up process is triggered by exposing the system to water and thus dissolving a sacrificial germanium oxide layer. Here, we determine the effect of the water treatment on the magnetic and optical properties of Py and CoPc. From MOKE magnetometry measurements we learn that the water exposure does not change the coercivity or the remanence of the layers. This information will help to manufacture prototype vertically stacked hybride spintronic devices.
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Apoorva Sharma, Patrick Matthes, Ivan Soldatov, Sri Sai Phani Kanth Arekapudi, Benny Böhm, Marina Lindner, Oleksandr Selyshchev, Nguyen Thi Ngoc Ha,
Michael Mehring, Christoph Tegenkamp, Stefan E. Schulz, Dietrich R.T. Zahn, Yossi Paltiel, Olav Hellwig, Georgeta Salvan Apoorva Sharma, Maria A. Hoffmann, Patrick Matthes, Olav Hellwig, Cornelia Kowol, Stefan E. Schulz, Dietrich R.T. Zahn, Georgeta Salvan Patrick Thoma, Manuel Monecke, Oana-Maria Buja, Dmytro Solonenko, Roxana Dudric, Oana-Tereza Ciubotariu, Manfred Albrecht, Iosif G. Deac,
Romulus Tetean, Dietrich R.T.Zahn, Georgeta Salvan Sreetama Banerjee, Daniel Bülz, Dmytro Solonenko, Danny Reuter, Carsten Deibel, Karla Hiller, Dietrich R.T. Zahn, Georgeta Salvan Peter Richter, Paul N. Plassmeyer, Julia Harzdorf, Tobias Rüffer, Heinrich Lang, Jana Kalbacova, Nathanael Jöhrmann, Steffen Schulze, Michael Hietschold,
Sri Sai Phani Kanth Arekapudi, Manfred Albrecht, Dietrich R.T. Zahn, Catherine J. Page, Georgeta Salvan Tobias Birnbaum, Torsten Hahn, Claudia Martin, Jens Kortus, Michael Fronk, Frank Lungwitz, Dietrich R.T. Zahn, Georgeta Salvan Cameliu Himcinschi, Ionela Vrejoiu, Georgeta Salvan, Michael Fronk, Andreas Talkenberger, Dietrich R. T. Zahn, David Rafaja, and Jens Kortus |
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