Field-induced magnetization of amorphous FexRu80−xB20

Abstract
Using an electron‐spin resonance (ESR) technique at 10 GHz we have determined the temperature dependence of the field‐induced magnetization in amorphous FexRu80−xB20 with 60≤x≤65. This concentration range includes a ferromagnet, a spin glass, and several reentrants. The ferromagnet displays typical T3/2 temperature dependence, while all other concentrations display the T dependence characteristic of spin glasses.