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Preparation, Microstructure, and Magnetic Properties of Electrodeposited Nanocrystalline L10 FePt Films

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Abstract

In this work, we prepared the nanocrystalline near-equiatomic FePt thin films by electrodeposition and explored the effects of annealing temperature and annealing time on morphology, structure, and magnetic properties of FePt film. The fcc-FePt phase starts to form when annealing at 400 °C under the 15% H2 gas mixture. With increasing annealing temperature from 400 to 800 °C, the FePt film experiences a gradual phase transformation from the soft magnetic fcc phase to the permanent magnetic fct L10 phase. The transition degree of the L10 phase is achieved to be 0.94 and coercivity reaches a maximum of 1.5 T for the sample annealed at 800 °C for 4 h. A shoulder behavior in the M(H) curves is found in the electrodeposited FePt films. Through fitting the M(H) curves by the model based on the transition degree of the L10 FePt phase, the shoulder behavior is quantitatively confirmed to originate from the coexistence of the soft magnetic fcc phase and the permanent magnetic L10 phase. The magnetic exchange coupling between the soft magnetic and permanent magnetic nanocrystalline phases is negligible in the electrodeposited FePt films due to that the substrate Ag diffusion into the FePt film separates the FePt nanocrystalline phases.

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Funding

This work was supported by the National Natural Science Foundation of China (NSFC) (NO. U1809215 and 51602285), Zhejiang Provincial Natural Science Foundation of China through Grant No. LY18E020016, and Science and Technology Program of Zhejiang Province – Public Welfare Technology (GC19E020014).

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Authors and Affiliations

  1. Research Center of Magnetic and Electronic Materials, College of Materials Science and Engineering, Zhejiang University of Technology, 18 Chao Wang Road, Hangzhou, 310014, Zhejiang, China

    Yao Ying, Huibin Wang, Jingwu Zheng, Jing Yu, Wangchang Li, Liang Qiao, Wei Cai & Shenglei Che

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  1. Yao Ying
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  2. Huibin Wang
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  3. Jingwu Zheng
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  4. Jing Yu
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  8. Shenglei Che
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Correspondence to Yao Ying or Jingwu Zheng.

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Ying, Y., Wang, H., Zheng, J. et al. Preparation, Microstructure, and Magnetic Properties of Electrodeposited Nanocrystalline L10 FePt Films. J Supercond Nov Magn 33, 3563–3570 (2020). https://doi.org/10.1007/s10948-020-05624-w

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  • DOI: https://doi.org/10.1007/s10948-020-05624-w

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