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Order–disorder effects in nitrided Sm–Fe permanent magnets

Authors
  • Meacham, B.E.
  • Shield, Jeffrey E.
  • Branagan, D.J.
Publication Date
May 01, 2000
Source
University of Nebraska - Lincoln
Keywords
License
Unknown
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Abstract

Rapidly solidified Sm11Fe89 was observed to form partially ordered Sm2Fe17. The ordering increased systematically with annealing temperature, reaching an order parameter of 0.8 after annealing at 950 °C for 15 min. The coercivity of the corresponding interstitial compound Sm2Fe17Nx varied with annealing temperature and thus order parameter. The coercivity reached a maximum for an order parameter of 0.45–5, then dramatically decreased as the order increased. This behavior is characteristic of demagnetization controlled by domain wall pinning by antiphase boundaries.

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