Magnetic Properties of Sm-Fe-(C, N) Melt-Spun Ribbons with Low Sm Content

Satoshi Sugimoto, Makoto Achiha, Hajime Nakamura, Toshio Kagotani, Terumi Tanaka, Masuo Okada, Motofumi Homma

Research output: Contribution to journalArticlepeer-review

Abstract

Possibility of the exchange-spring magnets in the Sm-Fe-(C, N) system has been studied by preparing the microduplex structure consisting of a nanocrystalline soft magnetic a-Fe phase and a hard magnetic Sm2Fe17(C, N)xphase. In this study, the microduplex structure was prepared by annealing the melt-spun ribbons in the amorphous state. The magnetic properties of annealed SmyFe95-5c5(y=5-10) ribbons after nitriding, whose Sm contents were lower than the stoichiometric composition of Sm2Fe17C, were investigated in correlation to their microstructures. In the as-spun state, Sm7-10Fe85-88C5(y=7-10) ribbons consist only of the amorphous phase, while in the Sm5Fe90C5(y=5) and Sm6Fe89C5(y=6) ribbons an a-Fe phase is also observed. The a-Fe phase in the ribbons withy=5 and 6 can be formed by the crystallization during melt-quenching. In all cases, the amorphous phase disappears after the annealing above 600°C, resulting in the microduplex structure with a-Fe and Sm2Fe17Cxphases. Relatively high coercivities were observed in the Sm7-10Fe85-88C5ribbons after annealing and subsequent nitriding. Especially, the Sm7Fe88C5ribbon annealed at 600°C for 5 min and subsequently nitrided at 450°C for 4 h exhibits the coercivity of 269 kAm-1with the maximum energy product of 70.1 kJm-3.

Original languageEnglish
Pages (from-to)917-922
Number of pages6
JournalMaterials Transactions, JIM
Volume35
Issue number12
DOIs
Publication statusPublished - 1994

Keywords

  • annealing for crystallization
  • coercivity
  • exchange interaction
  • melt-spun ribbon
  • nitriding
  • phase relation
  • spring magnet

ASJC Scopus subject areas

  • Engineering(all)

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