Abstract
Magnetization measurements in steady fields of up to 300 kOe were performed for disordered and ordered Ni1-xMnx alloys prepared by rapid quenching and subsequent annealing, in order to study the correlation between atomic ordering and magnetic properties. The high-field susceptibility of the rapid-quenched samples exhibited a maximum near x = 0.25, while that for the annealed samples had a distinct minimum also near x = 0.25. Magnetization isotherms at 4.2 K for rapid-quenched samples with 0.19≤ x ≤0.34 revealed the existence of considerable hysteresis, suggesting the existence of spin-glass-like states. The temperature dependence of low-field magnetization for the same samples exhibited typical freezing behavior at low temperatures, namely, an irreversibility of field-cooled and zero-field-cooled magnetization. The freezing temperature was found to increase with increasing Mn content x.
