Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 26, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/26/6/064213
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- US Department of Energy's Advanced Research Project Agency-Energy (ARPA-E)
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Chemically ordered L1(0)-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 (similar to 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.
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