Ferromagnetic ordering at room temperature is observed in amorphous Ge 100-xCrx (x in at.%) thin films fabricated by thermal co-evaporation over a wide composition range up to x = 39. High resolution transmission electron microscopy results indicate that the microstructure is mostly amorphous, except for at x = 15 (close to eutectic composition) and 39 where crystalline precipitates of Ge and the intermetallic Ge 19Cr11 compound are respectively formed in an amorphous matrix. The saturation magnetization at room temperature exhibits a maximum value of 2.5 emu/cc at x = 29 and the compositional dependence of saturation magnetization is supported by the microstructural results.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics