Study of novel materials and nanostructures for spin photonics and electronics

This work is dedicated to the study of two magnetic materials. Thin films of ferrimagnetic alloy GdxFe100−x fabricated with different compositions near the compensation temperature x . = 25 by magnetron sputtering on Si substrate with the usage of Ru and SiO2 capping layer were investigated. Measure- ments of the magneto-optic Kerr effect spectroscopy and magnetometry showed opposite signs in magnetization when the compensation temperature composi- tion exceeded as well as the enhancement of the effect for SiO2 capping layer. Spectroscopic ellipsometry revealed the complex diagonal element of the per- mittivity tensor. An attempt to prepare thin film of ferromagnetic tetragonal D022 − Mn3Ge was made. That was done firstly by calibrating Mn and Ge targets in magnetron sputtering machine and secondly simultaneous deposition of the elements on MgO (001) substrate with Cr buffer layer.