Abstract
The magnetic properties of compounds RCoAl have been studied in fields up to 50 kOe in the range 4–300 K. The random environment of rare earth atoms in the MgZn 2-type structure (Co and Al occupy 2a and 6h sites in a statistical manner) dictates a state of magnetic scatter order. As a result, intrinsic magnetic hardness develops in these materials. This phenomenon is absent in crystallographically well-ordered ternary ferromagnetic compounds such as RNiAl (Fe 2P type). The strength of intrinsic magnetic hardness depends on the strength of exchange.
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