Temperature-dependent spectral generalized magneto-optical ellipsometry for ferromagnetic compounds

Spectral generalized magneto-optical ellipsometry is presented as an optical tool for the simultaneous measurement of the complex index of refraction n ̃ = n + i k , the complex magneto-optical coupling parameter Q = Q r + i Q i (i.e., the Voigt-parameter), and the orientation of the saturation magnetization M s of isotropic ferromagnetic bulk materials. For wavelengths between 220 nm and 790 nm and at temperatures between 4.2 K and 800 K measurements on iron and permalloy demonstrate the comfortable application of this technique in order to resolve the spectral response of spin-polarized carriers and bands, which can provide valuable insight about the formation of the ferromagnetic state.