Abstract
Magnetic torque curves were measured on a NiS2 single crystal from 4.2 K up to Tc (30 K). The ordinary torque curve shows a large rotational hysteresis. The hysteresis decreases monotonically with increasing temperature and vanishes at Tc. With the use of magnetic annealing technique, the followings are concluded. (1) The easy axis for the weak ferromagnetic (WF) moment is the <100> axis, and even the magnetic field as strong as 21 kG cannot rotate the direction of the WF moment away from the axis. (2) However, the net magnetization can rotate mainly through 90°-wall displacements. The observed rotational hysteresis is due to the irreversibility of the wall displacements. (3) A single domain state for WF moment can be obtained by magnetic annealing along <100>. (4) It is inferred, from the estimation of the effective anisotropy constant, that the weak ferromagnetism of NiS2 must be one of its intrinsic properties.
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