Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.39: Poster

Freitag, 18. März 2011, 11:00–14:00, P2

vector magneto-optical generalized ellipsometry (VMOGE) — •kahming mok, nan du, and heidemarie schmidt — Institute of Ion-Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstrasse 400, 01328 Dresden, Germany

Numerous techniques have been utilized as experimental tools for magneto-optical (MO) characterization and the Kerr effect (MOKE) has been the most widely used method for this purpose so far. Recently, magneto-optical generalized ellipsometry (MOGE) has been developed to study layer systems with optical anisotropy induced by an external magnetic field. In our work, we setup a Vector-Magneto-Optical Generalized Ellipsometer (VMOGE) with a generalized spectroscopic ellipsometer and an octupole magnet. Not only measuring the MOKE of a sample, VMOGE also allows to perform generalized Mueller matrix ellipsometry in a magnetic field of arbitrary orientation and magnitude up to 0.4 T at room temperature, which provides a more general analysis for arbitrarily anisotropic and depolarizing materials. The VMOGE features a new "field orbit" measurement that can be performed without physically moving the sample, which is important for the analysis of MO thin films and layered nanostructure samples to study, e.g., exchange phenomena in multilayer samples, confinement, and collective magnetism. We discuss here exemplarily the investigation of a Cr₂O₃/Co/sapphire multilayer sample prepared by molecular beam epitaxy (MBE) by means of VMOGE. This optically isotropic sample system is chosen due to the well-known ferromagnetic properties of Co.