The magnetization is hardly saturated by external magnetic field for amorphous M-Fe (M = Y, Ce and La) alloys which exhibit the spin-glass behavior. The approach to saturation is established in the form of 1/H/1/2 for amorphous Y-Fe alloys. Similar results have been obtained for amorphous La-Fe and Ce-Fe alloys. Therefore, it is considered that the exchange interaction between the nearest neighbor Fe atoms is dominantly ferromagnetic. The evaluated magnetic moments per Fe atom from the high-field magnetization measurement are consistent with those obtained from the Mössbauer effect. The magnetic moment of Fe increases with the Fe content and goes up to about 2.1μB. The concentration dependence of the factor a for the 1/H1/2 term is different among these systems, being correlated with their magnetic phase diagrams. The high-field susceptibility is large, especially in the high Fe concentration range. This large high-field susceptibility should be associated with the instability of the magnetic moment of Fe.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering