Coercivity of pulverized ThMn12 compounds with a limited amount of ¡-(Fe,Co) phase

Tomoko Kuno, Shunji Suzuki, Kimiko Urushibata, Kurima Kobayashi, Satoshi Sugimoto

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We newly prepared the ThMn12 compounds (Sm0.9Zr0.1)(Fe0.8Co0.2)11.3Ti0.7 (A) and (Nd0.8Zr0.2)(Fe0.9Co0.1)11.3Ti0.7N1.5 (B), which were almost ¡-(Fe,Co) phase-free. These compounds show magnetic properties superior to those of the Nd2Fe14B phase in the high-temperature region (473 K). We also prepared a typical ¡-(Fe,Co) phase-free compound, Nd(Fe0.8Co0.2)11MoN1.3 (C), which has a low saturation polarization, but a high magnetic anisotropy field, and better thermal stability. We examined the effect of pulverization on the coercivity (Hc) of compounds (A)(C). The critical radii of single-domain particles (Rc) were about 120 nm for (A) and (B), and about 400 nm for (C), and were determined from the measured magnetic domain widths of the most coercive pulverized particles of each sample. As the pulverization time increased, Hc increased to maximum values of 0.10 MAm11 for (A), 0.14 MAm11 for nitrogenated (B), and 0.21 MAm11 for nitrogenated (C). Further pulverization of the samples decreased Hc. The decrease was mainly caused by oxidation in non-nitrogenated (A) and by the accumulation of lattice distortion in (B) and (C).

Original languageEnglish
Pages (from-to)1697-1706
Number of pages10
JournalMaterials Transactions
Volume60
Issue number8
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • Coercivity
  • Magnetic domain structure
  • Pulverization
  • Single-domain particles
  • ThMn structure

ASJC Scopus subject areas

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

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