Iron nitride permanent magnet and technique for forming iron nitride permanent magnet
A bulk permanent magnetic material may include between about 5 volume percent and about 40 volume percent Fe16N2 phase domains, a plurality of nonmagnetic atoms or molecules forming domain wall pinning sites, and a balance soft magnetic material, wherein at least some of the soft magnetic material is magnetically coupled to the Fe16N2 phase domains via exchange spring coupling. In some examples, a bulk permanent magnetic material may be formed by implanting N+ ions in an iron workpiece using ion implantation to form an iron nitride workpiece, pre-annealing the iron nitride workpiece to attach the iron nitride workpiece to a substrate, and post-annealing the iron nitride workpiece to form Fe16N2 phase domains within the iron nitride workpiece.
- Research Organization:
- Univ. of Minnesota, Minneapolis, MN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AR0000199
- Assignee:
- Regents of the University of Minnesota (Minneapolis, MN)
- Patent Number(s):
- 9,715,957
- Application Number:
- 14/766,101
- OSTI ID:
- 1532004
- Country of Publication:
- United States
- Language:
- English
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