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dc.contributor.author | Nandwana, Vikas | |
dc.contributor.author | Liu, J. Ping | |
dc.contributor.author | Poudyal, Narayan | |
dc.contributor.author | Rong, Chuan-Bing | |
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 | 2010-10-14T16:25:04Z | |
dc.date.available | 2010-10-14T16:25:04Z | |
dc.date.issued | 2007 | |
dc.identifier.citation | Published in the Journal of Applied Physics 102:023908-1-023908-7 | en_US |
dc.identifier.issn | 0021-8979 | |
dc.identifier.uri | http://hdl.handle.net/10106/5083 | |
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.description.sponsorship | Department of Physics, University of Texas at Arlington. NanoTech Institute, University of Texas at Dallas. School of Materials Science and Engineering, Georgia Institute of Technology. | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | AIP | 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 | Magnetic 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.identifier.externalLink | http://www.uta.edu/ra/real/editprofile.php?onlyview=1&pid=1866 | en_US |
dc.identifier.externalLinkDescription | Link to Research Profiles | en_US |
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