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Bulk FePt-based nanocomposite magnets with enhanced exchange coupling

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Bulk FePt-based nanocomposite magnets with enhanced exchange coupling

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dc.contributor.author Rong, Chuanbing
dc.contributor.author Nandwana, Vikas
dc.contributor.author Poudyal, Narayan
dc.contributor.author Liu, J. Ping
dc.contributor.author Kozlov, Mikhail E.
dc.contributor.author Baughman, Ray H.
dc.contributor.author Ding, Yong
dc.contributor.author Wang, Zhong Lin
dc.date.accessioned 2010-08-10T17:53:58Z
dc.date.available 2010-08-10T17:53:58Z
dc.date.issued 2007-07-23 en_US
dc.identifier.citation J. Appl. Phys. 102, 023908 (2007) en_US
dc.identifier.issn 0021-8979 (print)
dc.identifier.uri http://hdl.handle.net/10106/4993
dc.description.abstract High density bulk FePt/Fe3Pt nanocomposite magnets have been prepared by high-pressure warm compaction of chemically synthesized FePt and Fe3O4 nanoparticles. It is found that the density increases with the compaction pressure and temperature. Density of the bulk samples up to 95% theoretical value has been obtained while the nanostructured morphology is retained. It is also observed that a high pressure expedites the FePt phase transition from the disordered face-centered-cubic structure to the L10 structure, leading to the phase transition temperature in the compacts one hundred degrees lower than usual. This phase transition in turn facilitates the consolidation of the compacts. Magnetic characterizations showed that interphase exchange coupling is enhanced upon the compaction. Post-annealing of the compacts results in further improved magnetic performance of the compacts owing to interface modification. Energy products up to 16.3 MG Oe of the isotropic bulk nanocomposite magnets have been achieved, which is significantly higher than the theoretical limit for fully dense single-phase FePt magnets. en_US
dc.language.iso en_US en_US
dc.publisher American Institute of Physics en_US
dc.subject iron alloys en_US
dc.subject platinum alloys en_US
dc.subject ferromagnetic materials en_US
dc.subject permanent magnets en_US
dc.subject soft magnetic materials en_US
dc.subject nanocomposites en_US
dc.subject nanoparticles en_US
dc.subject magentic particles en_US
dc.subject compaction en_US
dc.subject annealing en_US
dc.subject exchange interactions (electron) en_US
dc.subject density en_US
dc.subject solid-state phase transformations en_US
dc.title Bulk FePt-based nanocomposite magnets with enhanced exchange coupling en_US
dc.type Article en_US
dc.publisher.department Department of Physics, The University of Texas at Arlington en_US
dc.identifier.externalLink http://link.aip.org/link/JAPIAU/v102/i2/p023908/s1 en_US
dc.identifier.externalLinkDescription External link to the published article en_US

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