Magnetic exchange coupling in amorphous Fe82−xHoxB18 alloys

Magnetic and anisotropy studies in amorphous Co80−xHoxB20 alloys

“…However, fields of about 3 T were necessary to saturate the samples which implies that some anisotropy is present, and therefore that the antiferromagnetic interaction between Co and Ho (J Co2Ho ) is stronger than the random anisotropy. Such situation has been observed for Fe-Ho-B alloys [14]. However, in amorphous Co-Er-B alloys the Er spin structure was found to be conical with a large average apex angle of about 82 , which was attributed to the strong random anisotropy of Er [9] and the antiferromagnetic interaction between Co and Er (J Co2Er ) which leads to a speromagnetic structure [15].…”