Magnetism and Nano-cluster in Inhomogeneous Phase of Ni-Mn Alloy

摘要

Ni_3Mn and Ni_(0.77)Mn_(0.23) alloys whichare ordered at 420 deg C have inhomogeneous phase, wherelong-range ordered magnetic domains dostribute in a disorderednon-magnetic matrix. Magnetism of these alloys with long-rangeordered parameter S from 0.13 to 0.44 shows aferromagnetic and a glass-like phases below and above the Curietemperature, respectively, the ferromagnetic cluster size obtainedby magnetic analysis of the glass-like phase for those alloys is1~3~3~3nm~3 and increases width S. Minimum cluster sizewhich forms a single domain is about 1~3nm~3. Magnetism ofalloy in which the volume fraction of ordered region is greaterthan 0.32(cluster size >3~3nm~3), is wholly ferromagnetic.