TEMPERATURE-DEPENDENCE OF THE UNIAXIAL MAGNETO-CRYSTALLINE ANISOTROPY ENERGY OF CO

Torque measurements have been made for a thin disc specimen of Co of which the disc plane was parallel to the (1010) plane at various temperatures between 4.2 K and the room temperature in an external magnetic field of 16.9 kOe which was strong enough to saturate the magnetization. The obtained values of Ku1 and Ku2 were in good agreement with those obtained by Rebouillat and Sucksmith and Thompson. The temperature dependence of Ku1 below about 200 K could well be explained with a model based on the itinerant electron theory by considering the thermal expansion of the lattice parameter ratio. © 1979, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.