Abstract

Ni3 Mn and Ni0.77Mn0.23 alloys which are ordered at 420°C have inhomogeneous phase, where long-range ordered magnetic domains distribute in a disordered non-magnetic matrix. Magnetism of these alloys with long-range ordered parameter S from 0.13 to 0.44 shows a ferromagnetic and a glass-like phases below and above the Curie temperature, respectively. The ferromagnetic cluster size obtained by magnetic analysis of the glass-like phase for those alloys is 13∼33 nm3 and increases width S. Minimum cluster size which forms a single domain is about 13 nm3. Magnetism of alloy in which the volume fraction of ordered region is greater than 0.32 (cluster size > 33 nm3), is wholly ferromagnetic.

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