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Both α and β modifications of FeB are ferromagnetic, and their Curie temperatures and saturation magnetizations are nearly the same, while their Mössbauer spectra are different each other. In order to clarify the origin of these differences, the Mössbauer effect of both α‐ and β‐FeB is measured under an external magnetic field of 4.0 T. The results obtained indicate that both α‐ and β‐FeB reveal anisotropic hyperfine fields. The distribution of the hyperfine field observed in the α‐FeB is discussed on the basis of an anisotropic hyperfine field as well as the proposed crystal structure.

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Light rare earth-iron alloys were coated on TbFeCo amorphous thin films by magnetron sputtering successively in a vacuum chamber. The coated films exhibit a larger polar Kerr rotation angle than that of the uncoated single layer films when the TbFeCo amorphous alloy contains more transition metal elements than the compensation composition. The coercive force changes little by coating light rare earth-iron alloys on the TbFeCo films.