Ni_1-_xMn_x (x=0.20,0.21,0.23,0.25,0.27)合金の熱磁気曲線と原子短範囲規則度

概要

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The thermomagnetization curves of rapidly quenched Ni_1-_xMn_x (x=0.20,0.21,0.23,0.25,0.27) alloys and Ni_<0.79>Mn_<0.21> alloy annealed at 693 K for 200 h and 1,000 h were investigated in the temperature range of 100-650 K. The change in saturation magnetization and Curie temperature with heat treatment and Mn concentration was studied on the basis of the atomic short-range order estimated by statistical and EXAFS methods. The magnetism of these alloys depends on the number of nearest-neighbor Mn atoms around an Mn atom. After annealing for 1,000 h, the thermomagnetization curve of Ni_<0.79>Mn_<0.21> alloy shows a double stage, which consists of the ferromagnetic phase and a long tail above the Curie temperature. The latter was analyzed by using a superparamagnetic model as a random set of ferromagnetic clusters distributed in a nonmagnetic matrix.
社団法人日本磁気学会の論文
1997-09-01