Hard magnetic FePt nanoparticles by salt-matrix annealing

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Hard magnetic FePt nanoparticles by salt-matrix annealing

Show simple item record Nandwana, Vikas Li, Daren Poudyal, Narayan Jin, Zhiqiang Elkins, Kevin Liu, J Ping 2010-10-12T19:20:30Z 2010-10-12T19:20:30Z 2006
dc.identifier.citation Published in Journal Of Applied Physics 99:08E911-1-08E911-3 en_US
dc.identifier.issn 0021-8979
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 ann en_US
dc.description.sponsorship Department of Physics, University of Texas at Arlington en_US
dc.language.iso en_US en_US
dc.publisher AIP en_US
dc.subject Fine-particle systems; nanocrystalline materials en_US
dc.subject Fe and its alloys en_US
dc.subject High coercivity materials en_US
dc.subject Magnetic anisotropy en_US
dc.subject Other heat and thermomechanical treatments en_US
dc.subject Solid-solid transitions en_US
dc.title Hard magnetic FePt nanoparticles by salt-matrix annealing en_US
dc.type Article en_US
dc.identifier.externalLink en_US
dc.identifier.externalLinkDescription Link to Research Profiles en_US

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