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The 20th ESICMM Seminar

Roles of typical elements (B, C, N, O, F) in the magnetic properties of strong permanent magnets: cobaltization, magneto-volume effect and others

開催日: 2015年9月3日(木) 終了

16:00-17:00 at The 2nd conference room, NIMS Sengen site, 1F

Prof.Kiyoyuki Terakura


 

Recently, we have performed very detailed calculations and analyses on magnetic moment and magnetic anisotropy of NdFe11TiX (X=B, C, N, O, F) [1] with particular emphasis on the roles of typical elements.  Magnetic moment of NdFe11TiX is strongly affected by magneto-volume effect which is insensitive to the kind of X and the chemical effect which is sensitive to X.  The “cobaltization” concept [2] of Kanamori is an important factor in the chemical effect and yet it is not sufficient to explain the trend of the magnetic moment variation among X.  We pointed out the important role of anti-bonding states formed by the X-Fe hybridization where not only Fe-3d states but also Fe-4sp states play important roles.  We also pointed out the importance of the local symmetry of X.  In the last respect, NdFe11TiN and NdFe12N are special among the rare-earth magnets.

[1] Y. Harashima et al.: submitted to Phys. Rev. B; arXiv:1507.03777v1.

[2] J. Kanamori, Prog. Theor. Phys. Suppl. 101, 1 (1990).

 




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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)
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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