ホーム > 研究活動 > 口頭発表(2018) > Computational approach to the magnetic properties of Ga-added Nd-Fe-B sintered magnets

研究活動

Computational approach to the magnetic properties of Ga-added Nd-Fe-B sintered magnets

TMS2018

2018年3月15日(木)

Yasutomi Tatetsu, Shinji Tsuneyuki, and Yoshihiro Gohda

Abstract

As reported in several experimental studies for Nd-Fe-B magnets, adding Ga into Nd-Fe-Bmagnets increases the coercivity. Nd6Fe13Ga exists around the interface of coercivity-improved Nd-Fe-B magnets. We calculated the magnetic anisotropy K1 of Nd inNd2Fe14B/Nd6Fe13Ga grain-boundary (GB) model from first principles to understand therelationship between coercivity and the Nd6Fe13Ga existence around the interface of Nd-Fe-B magnets. We used the computational code OpenMX. From the analysis of the magneticanisotropy K1 of Nd at the interface, we find that K1 of GB model systems is much higherthan K1 of Nd which is exposed to vacuum at a surface. Especially K1 of the several GB modelsystems is comparable to that of the Nd2Fe14B bulk. This K1 improvement suggests theimportance of the Nd6Fe13Ga existence around the interface of Nd-Fe-B magnets to gethigher coercivity.


研究活動

文部科学省

文部科学省
元素戦略プロジェクト(活動紹介)
NIMS磁石パートナーシップ

元素戦略拠点

触媒・電池元素戦略拠点
触媒・電池元素戦略研究拠点 (京都大学)
東工大元素戦略拠点
東工大元素戦略拠点 (東京工業大学)
構造材料元素戦略研究拠点
構造材料元素戦略研究拠点 (京都大学)
高効率モーター用磁性材料技術研究組合
高効率モーター用 磁性材料技術研究組合