Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Effects of Annealing Pressures on the Ordering and Microstructures of FePt:Ag Nanocomposite Films

  • Li, Xiaohong (College of Physics Science and Technology, Hebei University) ;
  • Feng, Zhaodi (College of Physics Science and Technology, Hebei University) ;
  • Li, Yang (College of Physics Science and Technology, Hebei University) ;
  • Song, Wenpeng (State Key Laboratory of Metastable Materials Science and Technology, Yanshan University) ;
  • Zhang, Qian (State Key Laboratory of Metastable Materials Science and Technology, Yanshan University) ;
  • Liu, Baoting (College of Physics Science and Technology, Hebei University)
  • Received : 2013.08.20
  • Accepted : 2013.10.30
  • Published : 2013.12.31
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Abstract

FePt:Ag (100 nm) nanocomposite thin films were prepared on naturally-oxidized Si substrates by dc magnetron sputtering at room temperature. X-ray diffraction (XRD) and transmission electron microscopy (TEM) are used to investigate the effects of annealing pressures on the ordering processes and microstructures of these films. The average sizes for the $L1_0$ ordered domains and the FePt grains are reduced to d = 9 nm and D = 13 nm from d = 19 nm and D = 34 nm, respectively, when the annealing pressure is enhanced to 0.6 GPa from room pressure at 873 K. Furthermore, the size distribution is improved into a narrow range. With increasing pressure, the coercivity of $L1_0$-FePt:Ag thin films decreases from 15.1 to 7.6 kOe. In the present study, the effects of high pressure on the $L1_0$ ordering processes and microstructures of FePt:Ag nanocomposite films were discussed.

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References

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