Tuning the Crystal Structure and Magnetic Properties of FePt Nanomagnets

Authors

  • J.-M. Qiu,

    1. The Center for Micromagnetics and Information Technologies (MINT), Department of Electrical and Computer Engineering, University of Minnesota, 4-174 200 Union Street SE, Minneapolis, MN 55455 (USA)
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  • J.-P. Wang

    1. The Center for Micromagnetics and Information Technologies (MINT), Department of Electrical and Computer Engineering, University of Minnesota, 4-174 200 Union Street SE, Minneapolis, MN 55455 (USA)
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  • This work was performed as part of the Information Storage Industry Consortium (INSIC) program in Heat Assisted Magnetic Recording (HAMR), with the support of the U.S. Department of Commerce, National Institute of Standards and Technology, Advanced Technology Program, Cooperative Agreement no. 70NANB1H3056. Partial financial support from Heraeus Corp. is acknowledged. We thank Professor C. Leighton for SQUID usage, Dr. S. McKernan for his help with TEM analysis, and Dr. J. Bai and Y.-H. Xu for fruitful discussion. The integrated nanoparticle deposition system used in this work was set up through J.-P.W.'s faculty startup fund from the University of Minnesota. Supporting Information is available online from Wiley InterScience or from the author.

Abstract

original image

Structure tuning of FePt nanomagnets is achieved by using a gas-phase condensation technique (see figure). Three types of FePt nanomagnets, A1 phase icosahedron, A1 phase octahedron, and L10 phase octahedron, with uniform size distributions are produced by directly manipulating the thermal environments for the nucleation and growth. The different magnetic performances of these nanomagnets are consistent with their structure variances.

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