Abstract
Experiments are described in which small particles of cubic cobalt have been obtained by precipitation from a 2% Co-Cu alloy for the purpose of measuring the total internal magneto-crystalline anisotropy field as a function of particle radius. Two methods have been used, namely static torque measurements of the principal anisotropy constants and dynamic measurements based on spin resonance in the anisotropy field. The two methods yield fair agreement in the values calculated for the anisotropy field in a range of particle sizes. The field is found to vary little with particle radius in a single crystal specimen and this is interpreted as evidence that internal resonance is independent of shape anisotropy.
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