High Field Magnetization in NiMn Alloys

Abstract

High field magnetization process was studied on disordered Ni_1−XMn_X alloys (X=0∼0.30) at 4.2 K using a pulsed magnetic field up to 400 kOe. A large induced magnetization was observed near the concentration X=0.25, where the spontaneous magnetization disappears. The experimental results support the presence of antiferromagnetic Mn atoms weakly coupled with host magnetic moments in the alloys.