NMR inNiFeMn and NiMn Alloys

NMR signals due to Mn atoms with antiparallel moments to the host magnetization have been observed in NiFe Mn and NiMn alloys. In NiFe Mn alloys the dependence of the integrated intensities of resonance lines associated with the parallel and antiparallel moments on Fe concentration shows the critical number of Fe atoms surrounding Mn to reverse the moment of Mn to be 4∼5, which is in good agreement with the theoretical result. The magnitude of the antiparallel moment is estimated to be about 1.9 µ B . In NiMn alloys there appear three resonance lines due to two parallel and one antiparallel moments. The concentration dependence of the intensities of these three signals is measured and the origin of these signals is discussed.