Abstract

Abstract The effects of hydrogen absorption on the iron and rare earth sublattice anisotropies in RE2Fe14B (RE ≡ Y, Nd, Ho, Tm) have been investigated using the singular point detection technique. Hydrogen is found to substantially depress both the iron and rare earth contributions to the magnetocrystalline anisotropy. However, such a reduction appears to be very large for holmium, and particularly for neodymium, which both give a resultant axial anisotropy. It is less important in the case of thulium which gives a resultant planar anisotropy. The observed hydrogen composition dependence of the holmium anisotropy implies the existence of a particular hydrogen filling sequence.

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