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A Controllability Investigation of Magnetic Properties for FePt Alloy Nanocomposite Thin Films

1
Science and Technology on Plasma Physics Laboratory, Research Center of Laser fusion, China Academy of Engineering Physics, Mianyang 621900, China
2
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
3
School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621000, China
4
Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(1), 53; https://doi.org/10.3390/nano9010053
Received: 5 December 2018 / Revised: 26 December 2018 / Accepted: 27 December 2018 / Published: 3 January 2019
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Abstract

An appropriate writing field is very important for magnetic storage application of L10 FePt nanocomposite thin films. However, the applications of pure L10 FePt are limited due to its large coercivity. In this paper, the ratios of L10 and non-L10 phase FePt alloy nanoparticles in FePt/MgO (100) nanocomposite thin films were successfully tuned by pulsed laser deposition method. By adjusting the pulsed laser energy density from 3 to 7 J/cm2, the ordering parameter initially increased, and then decreased. The highest ordering parameter of 0.9 was obtained at the pulsed laser energy density of 5 J/cm2. At this maximum value, the sample had the least amount of the soft magnetic phase of almost 0%, as analyzed by a magnetic susceptibility study. The saturation magnetization decreased with the increase in the content of soft magnetic phase. Therefore, the magnetic properties of FePt nanocomposite thin films can be controlled, which would be beneficial for the magnetic applications of these thin films. View Full-Text
Keywords: pulse laser deposition; FePt alloy; magnetic phase pulse laser deposition; FePt alloy; magnetic phase
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Yu, J.; Xiao, T.; Wang, X.; Zhou, X.; Wang, X.; Peng, L.; Zhao, Y.; Wang, J.; Chen, J.; Yin, H.; Wu, W. A Controllability Investigation of Magnetic Properties for FePt Alloy Nanocomposite Thin Films. Nanomaterials 2019, 9, 53.

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