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Abstract
An attempt has been made to elucidate the mechanism of magnetic hardening in a 1·5 wt. % cobalt-gold alloy from a detailed investigation of the coercivity, remanence coercivity, torque curves and their temperature dependence. From a detailed analysis of the torque curve in the (001) plane of a single crystal it has been established that the high observed coercivities ∼ 1600 oe can be accounted for in terms of single domain particles with high uniaxial shape anisotropy (Stoner and Wohlfarth 1948) and that the contribution due to magnetocrystalline anisotropy is about 20% of this.
The temperature variations of the coercivity, H c, and the remanence coercivity, HR, have also been accounted for in terms of a single domain particle model in which the process of magnetization reversal is assisted by thermal agitation.