Inspired by nature: investigating tetrataenite for permanent magnet applications

Chemically ordered L10-type FeNi, also known as tetrataenite, is under investigation as a rare-earth-free advanced permanent magnet. Correlations between crystal structure, microstructure and magnetic properties of naturally occurring tetrataenite with a slightly Fe-rich composition (∼Fe55Ni44) obta...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2014-02, Vol.26 (6), p.064213-064213
Main Authors: Lewis, L H, Mubarok, A, Poirier, E, Bordeaux, N, Manchanda, P, Kashyap, A, Skomski, R, Goldstein, J, Pinkerton, F E, Mishra, R K, Kubic Jr, R C, Barmak, K
Format: Article
Language:English
Subjects:
Anisotropy
Biological Products
Condensed matter
Crystal structure
Curie temperature
Iron
Magnetic Phenomena
Magnetic properties
Magnets - chemistry
Metals - chemistry
Meteorites
Meteoroids
Microstructure
Models, Molecular
Molecular Conformation
Permanent magnets
Phase Transition
Temperature
Time Factors
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Summary:Chemically ordered L10-type FeNi, also known as tetrataenite, is under investigation as a rare-earth-free advanced permanent magnet. Correlations between crystal structure, microstructure and magnetic properties of naturally occurring tetrataenite with a slightly Fe-rich composition (∼Fe55Ni44) obtained from the meteorite NWA 6259 are reported and augmented with computationally derived results. The tetrataenite microstructure exhibits three mutually orthogonal crystallographic variants of the L10 structure that reduce its remanence; nonetheless, even in its highly unoptimized state tetrataenite provides a room-temperature coercivity of 95.5 kA m−1 (1200 Oe), a Curie temperature of at least 830 K and a largely temperature-independent anisotropy that preliminarily point to a theoretical magnetic energy product exceeding (BH)max = 335 kJ m−3 (42 MG Oe) and approaching those found in today's best rare-earth-based magnets.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/26/6/064213