Bridging atomistic magnetism and coercivity in Nd-Fe-B magnets

0492749 - FZÚ 2019 RIV US eng J - Journal Article
Tsuchiura, H. - Yoshioka, T. - Novák, Pavel
Bridging atomistic magnetism and coercivity in Nd-Fe-B magnets.
Scripta Materialia. Roč. 154, Sep (2018), s. 248-252. ISSN 1359-6462. E-ISSN 1872-8456
R&D Projects: GA ČR GA15-03777S
Institutional support: RVO:68378271
Keywords : permanent magnets * coercivity * Nd-Fe-B * first-principles calculations
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 4.539, year: 2018

Coercivity in rare-earth permanent magnets depends on the size and shape of magnetic grains. Recent experimental studies have revealed that, however, atomic scale structures around the grain-boundaries of magnets also play a crucial role to determine their coercivity. In this paper, we construct an effective spin model for the Nd2Fe14B structure based on first-principles calculations to describe atomistic magnetization dynamics of the magnetic grains, incorporating the information of the electronic states of the system. We find that the Nd ions located on the surfaces of the grains may have planar magnetic anisotropy, and that they can cause coercivity reduction.
Permanent Link: http://hdl.handle.net/11104/0286127