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Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 38: MagneticThin Films I

MA 38.12: Vortrag

Donnerstag, 29. März 2012, 12:30–12:45, H 0112

Magneto-optical coupling in ferromagnetic thin films investigated by VMOGE — •Kahming Mok1, Camelia Scarlat1, György J. Kovacs1, Lin Li2, Vitaly Zviagin1, Jeffrey McCord3, Manfred Helm1, and Heidemarie Schmidt11Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Germany — 2State Key Laboratory of Nuclear Physics and Technology, Peking University, China — 3Institute of Materials Science, University of Kiel, Germany

We investigated the magneto-optical coupling in ferromagnetic thin films (Fe, Ni20Fe80, Co, Ni80Fe20, Ni) in the spectral range from 300 to 1100 nm. We performed Mueller matrix ellipsometry measurements in a magnetic field of arbitrary orientation and magnitude up to 400 mT at room temperature with a set-up vector-magneto-optical generalized ellipsometer (VMOGE). We extracted the magneto-optical dielectric tensor εMO of the ferromagnetic thin films under saturated in-plane magnetization conditions. The off-diagonal elements of the εMO depend on the net spin polarization and the electronic band structure of the magnetized material. For ferromagnetic Fe, Co, and Ni, the converted εMO agrees well with reported experimental optical conductivity data. With additional measurements on the magnetization of the ferromagnetic thin films, we extracted the magnetic field independent magneto-optical coupling constant Q, which is a useful parameter for characterization of magneto-optical materials.

Reference: K. Mok et al., Phys. Rev. B 84, 094413 (2011)

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