PLD法を用い作製したPr-Fe-B/Fe-Co積層型ナノコンポジット磁石膜の磁気特性ならびに微細構造に関する研究

抄録

Although we have prepared Pr-Fe-B/α-Fe multilayered nanocomposite thick-film magnets by a pulsed laser deposition (PLD) method, it was difficult to maintain the multi-layered structure through an annealing process. Namely, a transmission electron microscopy (TEM) observation of the above-mentioned sample revealed that the microstructure varied from a multilayered structure (as-deposited) to a dispersed one through the annealing process. In this study, a Fe-Co phase instead of an α-Fe one as a soft layer was adopted in this study to investigate the mechanism of destruction of the multi-layered structure. It was clarified that the origin of the destruction exists in an α-Fe phase of an as-deposited Pr-Fe-B layer. Furthermore, the (BH)_max value of an obtained film magnet was approximately 115 kJ/m³.