Magnetic anisotropy induced by magnetic field cooling in Ni3Mn alloys

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Abstract
The magnetic anisotropy of Ni3Mn alloys with various degrees of atomic order has been investigated by a torque magnetometry. By cooling down from 300 to 80 K in a magnetic field of 10 kOe, a unidirectional anisotropy Kd with a period of 360° was induced. The temperature dependence of this anisotropy can be expressed by exp(Q/T) from 50 to 20 K and by log(T) below 20 K. The magnitude of Kd was increased by a factor of 100 during cooling down from 50 to 4.2 K. Furthermore, the hysteresis loop at 4.2 K for a disordered alloy was shifted such that the easy direction of magnetization is that of the cooling magnetic field. They are discussed in terms of exchange anisotropy and the size distribution of clusters with antiferromagnetic coupling.

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