Alignment and angular dependences of coercivity for (Sm,Ce)2(Co,Fe,Cu,Zr)17 magnets

Yutaka Matsuura, Ryuji Tamura, Keisuke Ishigami, Kazushi Sumitani, Kentaro Kajiwara, Tetsuya Nakamura

Research output: Contribution to journalArticlepeer-review

Abstract

The alignment and angular dependences of the coercivity of (Sm, Ce)2(Co, Fe, Cu, Zr)17 magnets were investigated. The coercivity of an aligned magnet is slightly larger than that of the isotropically aligned magnet. This result differs from those of Nd-Fe-B sintered magnets and ferrite magnets. In regard to the angular dependence, the coercivity of (Sm, Ce)2(Co, Fe, Cu, Zr)17 magnets decreases from 0° to 40° and increases thereafter. The trend is similar to that observed in Ga-doped Nd-Fe-B sintered magnets and ferrite magnets and reproduces those expected from a Stoner-Wohlfarth model or a coherent rotation of magnetization, even though the magnetization reversals for these magnets proceed through the motion of magnetic domain walls. The angular dependence of the coercivity of isotropically aligned magnets agrees well with the calculation results for angles up to 50° obtained under the assumption that the magnetization of every grain reverses independently through the motion of magnetic domain walls. These results support strongly the conclusion that the coercivity of Ga-doped Nd-Fe-B sintered magnets and ferrite magnets, both which have an angular dependence similar to (Sm, Ce)2(Co, Fe, Cu, Zr)17 magnets, is determined by the motion of magnetic domain walls.

Original languageEnglish
Pages (from-to)1009-1012
Number of pages4
JournalMaterials Transactions
Volume62
Issue number7
DOIs
Publication statusPublished - 2021

Keywords

  • Coercivity
  • Coercivity mechanism
  • Magnet
  • Permanent magnet
  • SmCo magnet
  • SmCo magnet

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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