Hard magnetic FePt nanoparticles by salt-matrix annealing

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Hard magnetic FePt nanoparticles by salt-matrix annealing

Show simple item record Li, Daren Poudyal, Narayan Nandwana, Vikas Jin, Zhiqiang Elkins, Kevin Liu, J. Ping 2010-08-10T18:51:34Z 2010-08-10T18:51:34Z 2006-04-26 en_US
dc.identifier.citation J. Appl. Phys. 99 08E911 (2006) en_US
dc.description Proceedings of the 50th Annual Conference on Magentism and Magnetic Materials. L10 and Other Hard Magnetic Materials L10 and Other Hard Magnetic Materials L10 and Other Hard Magnetic Materials. L10 and Other Hard Magnetic Materials. en_US
dc.description.abstract To transfer face-centered-cubic (fcc) FePt nanoparticles to the face-centered-tetragonal (fct) phase with high magnetic anisotropy, heat treatments are necessary. The heat treatments lead to agglomeration and sintering of the nanoparticles. To prevent the particles from sintering, salts as the separating media (matrix) have been used for annealing the nanoparticles in our experiments. The fcc nanoparticles produced by chemical synthesis were mixed with NaCl powders. The mixture was then annealed in forming gas (93%H2+7%Ar) in different conditions to complete the fcc to fct phase transition. After the annealing, the salt was washed out by water and monodisperse fct FePt nanoparticles were obtained. Detailed studies on the effect of the NaCl-to-FePt weight ratios (from 1:1 to 400:1) have been performed. It was found that a suitable NaCl-to-FePt ratio is the key to obtain monodisperse fct FePt nanoparticles. A higher NaCl-to-FePt ratio is needed for larger particles when the annealing conditions are the same. Increased annealing temperature and time should be accompanied by a higher NaCl-to-FePt ratio. Magnetic measurements show very high coercivity (up to 30 kOe) of the monodispersed fct nanoparticles by the salt-matrix annealing. en_US
dc.description.sponsorship Jointly sponsored by Physics Conferences, Inc. (AIP) and The IEEE Magnetics Society 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 magnetic particles en_US
dc.subject nanoparticles en_US
dc.subject permanent magnets en_US
dc.subject annealing en_US
dc.subject magnetic anisotrophy en_US
dc.subject solid-sstate phase transformations en_US
dc.subject coercive force en_US
dc.title Hard magnetic FePt nanoparticles by salt-matrix annealing en_US
dc.type Article en_US
dc.publisher.department Department of Physics, The University of Texas at Arlington en_US
dc.identifier.externalLink en_US
dc.identifier.externalLinkDescription External link to the published article en_US

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