Abstract
The magnetocrystalline anisotropy in TbCu7-type SmFe7 epitaxial films has been verified in relation to the 4f-electron character. The reinforcement of the 4f intermultiplet mixing by nitrogenation is verified from an enlarged basal-plane anisotropy. The sign of the uniaxial anisotropy constant is varied from positive to negative by nitrogenation, in contradiction to behaviors in Th2Zn17-type Sm2Fe17Nx. 57Fe Mössbauer spectroscopy and first-principles calculation revealed that the transformation of the Sm-neighboring Fe-atom plane from a rippling to a flat shape, which characterizes the Th2Zn17- and TbCu7-type local structures, markedly modulates the magnetic anisotropy, owing to the 4f semilocalized character.
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