Width of the ferromagnetic resonance line in highly dispersed powders of crystalline and amorphous Co-P alloys

The resonance characteristics (inhomogeneous FMR linewidth Delta H) in high ly dispersed (d=0.1-3 mu m) powders of crystalline and amorphous Co-P alloy s are investigated as a function of the composition, particle size, and ato mic structure. It is established that Delta H for powders of amorphous Co-P alloys is two to three times larger than Delta H for crystalline Co-P powd ers. According to the investigations performed, this is caused by thermodyn amically stimulated segregation of nonmagnetic Co2P inclusions, apparently an effective relaxation channel, in the amorphous state of Co-P powders. (C ) 1999 American Institute of Physics. [S1063-7834(99)01903-6].