Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.47: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Quadratic magnetooptic spectroscopy of bcc Fe and Co2MnSi thin films — •Robin Silber1, 2, Gerhard Götz2, Lukáš Beran3, Daniel Král3, Jaromír Pištora1, Günter Reiss2, Martin Veis3, Timo Kuschel2, and Jaroslav Hamrle1 — 1VSB - Technical University of Ostrava, Czech Republic — 2CSMD, Physics Department, Bielefeld University, Germany — 3Charles University in Prague, Czech Republic
The magnetooptic Kerr effect (MOKE) is a well known physical phenomena that enables detailed characterization of magnetic material properties. However, quadratic MOKE (QMOKE) is not well understood yet. Hence, QMOKE anisotropy measurements [1] or QMOKE spectroscopy are methods convenient for investigations of the magnetooptic effect quadratic in magnetization. Within the materials having a cubic crystal symmetry, any dependence of the permittivity elements on the direction of the magnetizaton (within the second order in magnetization) can be expressed by two, generally complex parameters G11-G12 and 2G44 [2]. We present here QMOKE spectra of those parameters for the bcc Fe and the Co2MnSi Heusler alloy thin films as a novel spectroscopic approach revealing detailed magnetooptic information within the second order effects in magnetization. Both materials exhibit change of the QMOKE spectra with change of the crystallographic structure, which is achieved by post annealing at different temperatures.
[1] K. Postava et al., J. Appl. Phys. 91, 7293 (2002)
[2] J. Hamrle et al., J. Phys. D: Appl. Phys. 40, 1563 (2007)