Abstract
We have studied by 57Fe Mössbauer spectroscopy and low field magnetization on oriented powders the temperature and hydrogen dependence of the magnetic structure of R2Fe14B compounds with R=Dy, Ho, and Y. We show that the iron sublattice may be canted by an angle ≂15° at high temperature. Hydrogen increases this canting at low temperature. It increases the spin reorientation temperature measured by bulk magnetization for Ho2Fe14B and induces a spin reorientation in the Dy alloys. These effects show that the strength of the crystal field terms of fourth (and maybe sixth) order compared to the terms of second order is increased by hydrogen.
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