Thin films of Ge100-xFex (x in at%) alloys, fabricated by thermal co-evaporation, have an amorphous structure at compositions x<∼40, although an unidentified crystalline phase with an FCC symmetry also exists at low Fe content. Magnetization versus temperature curves show that saturation magnetization is non-zero (1 to 2.5 emu/cm3) and remains nearly unchanged up to the highest measured temperature of 350 K. Magnetic hysteresis loops at room temperature show a typical ferromagnetic shape, complete saturation occurring by 1-2 kOe. These results may indicate ferromagnetic ordering at room temperature. No definite tendency is observed in the compositional dependence of saturation magnetization.
Bibliographical noteFunding Information:
Financial support from the Research Center of Advanced Magnetic Materials at CNU is gratefully acknowledged. The authors wish to thank W. B. Paek for her help in structural characterizations.
- Amorphous Ge-Fe alloys
- High Curie temperature
- Magnetic properties
- Thin films
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics