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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 Silber^{1, 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)