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Influence of copper concentration on the magnetic properties and structure of alloys

A systematic investigation is made of the behaviour of the hysteresis properties and magnetic parameters of phases of alloys Sm(Co,Fe,Cu,Zr) 7.3 during the formation of a high-coercivity state during step ageing. It is shown that the experimental dependence of H c on copper concentration in the 1:5 phase is in qualitative agreement with the result given by the model of pinning of boundaries by planar defects. The reasons for the observed quantitative differences are discussed