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The 26th ESICMM Seminar

( L1_0 and D0_22-type Mn-based hard magnets)

開催日: 2017年1月18日(水) 終了

13:30-14:45 at Middle conference room, NIMS Sengen site, 8F

Development of Mn-based novel magnetic materials through lattice engineering

Prof. TOSHIYUKI SHIMA(Tohoku Gakuin University)

 Nd-Fe-B based permanent magnet is mainstream of the high efficiency permanent magnet, which originates from high magnetocrystalline anisotropy, high saturation magnetization and relatively high coercive force. However, due to the scarce and localized natural resources of the “strategic” rare earth elements, it is necessary to explore or create novel hard magnetic materials with high magnetocrystalline anisotropy without or less usage of these elements. Among them, a Mn-based alloy system is now attracted much attention, since it possesses high magneto-crystalline anisotropy, high Curie point and specific crystal structure such as L10 and D022 crystal structures. In this talk, recent our results on Mn-based alloys will be introduced.

Enhancement of magnetization and magnetic anisotropy in Mn-Ga alloys:
A first-principles study

Prof. MASAFUMI SHIRAI (Tohoku University)

We have explored the guideline for enhancing the magnetization and the magnetic anisotropy of D022-Mn3Ga and L10-MnGa on the basis of first-principles calculations. We investigated the effect of substituting 3d transition-metals (TM: Ti, V, and Cr) for Mn in ferrimagnetic Mn3Ga. While the magnetization increases with increasing TM concentration, the uniaxial magnetic anisotropy is weakened with doping due to the reduction of the tetragonal distortion. We investigated the effect of substituting non- magnetic elements for Ga in Mn3Ga and MnGa to enhance the magnetization by expanding the volume.
This work was partly supported by JST under Collaborative Research Based on Industrial Demand. 


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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