Properties of a rare earth free L1 0 -FeNi hard magnet developed through annealing of FeNiPC amorphous ribbons

Jihye Kim, Sumin Kim, Jin Yoo Suh, Yong Jin Kim, Young Keun Kim, Haein Choi-Yim

Research output: Contribution to journalArticle

Abstract

The rare-earth-free hard magnetic L1 0 -FeNi phase found in cosmic meteorites demonstrates potential as a next-generation permanent magnet. However, it is very difficult to artificially produce the L1 0 -FeNi phase due to the low atomic diffusion coefficients of Fe and Ni near the order-disorder transition temperature (∼320 °C). Therefore, FeNiPC amorphous alloy systems exhibiting crystallization temperature (T x ) near the transition temperature were investigated. The amorphous alloys were annealed at T x , resulting in high atomic diffusion. The structural and microstructural characterizations of annealed ribbons revealed the formation of L1 0 -FeNi phase through observation of the superlattice peak. The magnetic property, such as coercivity (H c ), also indicated the formation of L1 0 -FeNi phase, because the maximum H c value is 641 Oe after the annealing process.

Original languageEnglish
Pages (from-to)599-605
Number of pages7
JournalCurrent Applied Physics
Volume19
Issue number5
DOIs
Publication statusPublished - 2019 May 1

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Keywords

  • Amorphous alloy
  • Crystallization temperature
  • Hard magnet
  • L1 -FeNi phase
  • Order-disorder temperature
  • Superlattice

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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