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Magnetic properties of perpendicularly orientated L10 FePt nanoparticles

  • Articles
  • Condensed Matter Physics
  • Published:
Chinese Science Bulletin

Abstract

L10 FePt films were deposited on MgO (001) substrates heated to 700°C by magnetron sputtering. Assisted by the misfit of lattice between film and substrate, strong (001) texture was formed. The film at nominal thickness t N = 5 nm was composed of nanoparticles with a size of ∼70 nm, and showed a high coercivity of ∼105 kOe at 4.2 K. At t N =∼50 nm, as the film changed from discontinuous to continuous, the coercivity dropped about one order of magnitude. Micromagnetic simulation implies that the magnetization reversal is a vortex-like nuclear type. The ideal coercivity of a separated single-domain L10 FePt nanoparticle with a size of 70 nm× 70 nm× 5 nm is ∼121 kOe. This tells us that the experimental coercivity has nearly reached the limit of ideal single crystalline nanoparticles.

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Authors and Affiliations

  1. School of Physics Science and Technology, Southwestern University, Chongqing, 400715, China

    XiaoJing Mo, Hui Xiang, GuoQing Li, Peng Chen, ZuHong Xiong & JunZhong Wang

  2. Faculty of Engineering and Resource Science, Akita University, Akita, 010-8502, Japan

    ShunJi Ishio & Hitoshi Saito

  3. Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan

    ToshiYuki Shima & KoKi Takanashi

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  1. XiaoJing Mo
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  2. Hui Xiang
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  3. GuoQing Li
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  4. Peng Chen
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  5. ZuHong Xiong
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  7. ShunJi Ishio
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  8. Hitoshi Saito
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  9. ToshiYuki Shima
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  10. KoKi Takanashi
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Correspondence to GuoQing Li.

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Mo, X., Xiang, H., Li, G. et al. Magnetic properties of perpendicularly orientated L10 FePt nanoparticles. Chin. Sci. Bull. 55, 680–686 (2010). https://doi.org/10.1007/s11434-010-0077-7

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  • DOI: https://doi.org/10.1007/s11434-010-0077-7

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