Abstract
We have studied the magnetic properties of a melt-spun granular sample of Cu 87Co 13. The Cu matrix contains very fine particles of Co, having a bimodal distribution of sizes: ‘larger’ particles ( ∼ 300 A ̊ ) and very much smaller particles ( < 15 A ̊ ) with the latter exhibiting superparamagnetism. The magnetisation data indicate a spread of sizes for the smaller superparamagnetic particles, ranging from individual Co atoms up to clusters of more than 100 atoms of Co. Assuming a simple distribution of particle sizes, we calculated the magnetic field dependence of the magnetisation of the superparamagnetic particles and find excellent agreement with experiment.
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