The Magnetic Properties and their Temperature Dependence of Ferromagnetic Alloys with an Order-disorder Tsansformation. II Ni₃Mn

Measurements on the change of magnetic properties with the formation of the superlattice and their temperature dependency at a fixed state of order has been carried out on the ferromagnetic alloy Ni 3 Mn which shows characteristic properties different from the same A 3 B type Ni 3 Fe. Measurements were made by the apparatus described in Report I. Ni 3 Mn is known to undergo an order-disorder transformation in the temperature range 600°C to 300°C. Major results obtained are; (1) the ferromagnetic Curie point increases from below room temperature at the disordered state to over 490°C at the ordered state, (2) saturation magnetostriction is very small and the temperature dependence complicated, (3) large and long magnetic after-effects were found at the intermediate states of order.