Nd-Fe-B系化合物とナノコンポジット薄膜磁石

概要

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A modeling method for calculating magnetic properties of Nd2Fe14B-type intermetallics has been introduced based upon the crystalline-electric-field interaction at the Nd ions and exchange interaction between Nd and Fe sublattices. Next, as an extension of this modeling, experimental results of magnetostriction measurements in the vicinity of spin-reorientation transition in (Er-Tb)2Fe14B system was presented, which have been quantitatively understood by the calculation. In these cases, the magnetic anisotropy and the magnetization are dominated separately by the rare-earth and Fe sublattices, respectively, within a unit cell. The third part of this article is dedicated to a topics of hard / soft nanocomposite magnets, which can be regarded as an extension of the two sublattice model in larger length scale. Magnetic properties of nanocomposite Nd2Fe14B / a-Fe multilayer thin films were investigated and discussed in conjunction with the micromagnetic calculations.