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MA: Fachverband Magnetismus
MA 22: Magnetic Measurement Methods
MA 22.6: Talk
Tuesday, March 15, 2011, 12:15–12:30, HSZ 403
magneto-optical dielectric tensor of Co, Fe, Ni, and of NiFe alloys under saturated magnetization conditions — •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
Magneto-optical generalized ellipsometry (MOGE) has become extensively important for characterization the magneto-optical response of single and multilayer materials. We setup a Vector-Magneto-Optical Generalized Ellipsometer (VMOGE) in the spectral range from 250 nm to 1100 nm using an octupole magnet, to perform VMOGE measurements of the Mueller matrix in a magnetic field of arbitrary orientation and magnitude up to 0.4 T at room temperature. The VMOGE features a new "field orbit" measurement that can be performed without physically moving the sample, which is useful to study magnetic multilayer or nanostructure samples. An optical model based on the 4 x 4 matrix formalism is required to evaluate and fit the experimental Mueller matrix data. Searching the best match model between experimental and calculated VMOGE data, the magneto-optical dielectric tensor єMO of each layer in a multilayer sample system can be determined. In this work, we investigate the magneto-optical properties of the elemental ferromagnets Co, Fe, and Ni, as well as of Ni1−xFex alloys (x=0.20, 0.65, and 0.80). We extracted the wavelength dependence of the magneto-optical dielectric tensor under saturated magnetization conditions.