Abstract
Magnetic measurements at various temperatures have been performed for loose powder and field-oriented samples of Gd1−xDyxCo4B with x=0, 0.05, and 0.1. The temperature dependences of spontaneous magnetization in these compounds are determined. It is found that a spin reorientation occurs at around T=162 K for Gd0.95Dy0.05Co4B and at around 225 K for Gd0.9Dy0.1Co4B. The temperature dependences of magnetic anisotropy constants, K1(Gd1−xDyxCo4B), of Gd1−xDyxCo4B with x=0 and 0.1 are determined. The anomalous temperature dependence of K1 (GdCo4B) is well explained by taking account of the Gd sublattice magnetic anisotropy due to the dipole–dipole interaction and the Co sublattice magnetic anisotropy similar to that in YCo4B. The temperature dependence of the Dy sublattice magnetic anisotropy constant, K1(Dy), has also been determined by making use of K1(GdCo4B) and K1(Gd0.9Dy0.1Co4B).
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