Microstructures and magnetic alignment of L10 FePt nanoparticles

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Microstructures and magnetic alignment of L10 FePt nanoparticles

Show simple item record Nandwana, Vikas Kang, Shishou Shi, Shifan Jia, Zhiyong Thompson, G.B. Nikles, David E. Harrell, J.W. Poudyal, Narayan Liu, J. Ping 2010-10-13T20:41:57Z 2010-10-13T20:41:57Z 2009
dc.identifier.citation Published in Journal of Applied Physics 101 en_US
dc.identifier.issn 0021-8979
dc.description.abstract Chemically ordered FePt nanoparticles were obtained by high temperature annealing a mixture of FePt particles with NaCl. After the NaCl was removed with de-ionized water, the transformed FePt nanoparticles were redispersed in cyclohexanone. X-ray diffraction patterns clearly show the L10 phase. Scherrer analysis indicates that the average particle size is about 8 nm, which is close to the transmission electron microscopy (TEM) statistical results. The coercivity ranges from 16 kOe to more than 34 kOe from room temperature down to 10 K. High resolution TEM images reveal that most of the FePt particles were fully transformed into the L10 phase, except for a small fraction of particles which were partially chemically ordered. Nano-energy dispersive spectroscopy measurements on the individual particles show that the composition of the fully transformed particles is close to 50/50, while the composition of the partially transformed particles is far from equiatomic. TEM images and electron diffraction patterns indicate c-axis alignment for a monolayer of L10 FePt particles formed by drying a dilute dispersion on copper grids under a magnetic field. For thick samples dried under a magnetic field, the degree of easy axis alignment is not as high as predicted due to strong interactions between particles. en_US
dc.description.sponsorship Department of Physics, University of Texas at Arlington. Center for Materials for Information Technology, The University of Alabama 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 nanoparticles en_US
dc.subject annealing en_US
dc.subject X-ray diffraction en_US
dc.subject magnetic particles en_US
dc.subject particle size en_US
dc.subject transmission electron microscopy en_US
dc.subject magnetic structure en_US
dc.subject coercive force en_US
dc.subject solid-state phase transformations en_US
dc.title Microstructures and magnetic alignment of L10 FePt nanoparticles 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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