The magnetocrystalline anisotropy constants Ku1 and K u2 of Co-Ni alloys containing Ni up to 30 % were measured at temperatures between 77 K and 700 K by means of a torque magnetometer. For the alloys containing Ni less than about 7 %, the sign of Ku1 was found to change from positive to negative in the h.c.p. phase. The temperature at which Ku1 becomes zero was found to increase from 510 K for Co to 620 K for 5 %Ni-Co alloy. The temperature dependences of Ku1 and K u2 are discussed on the basis of the theory developed by Zener and Carr. It is clarified that the temperature dependences of Ku1 and Ku2 cannot be explained by the power law of the reduced magnetization. The contributions of the magnetoelastic coupling energy to K u1 and Ku2 are discussed. The obtained value of ΔKu2 for Co is one-tenth or one-hundredth as small as the value of Ku2.
|Number of pages||8|
|Journal||Journal of the Physical Society of Japan|
|Publication status||Published - 1978 Mar|
ASJC Scopus subject areas
- Physics and Astronomy(all)