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Spin wave-assisted reduction in switching field of highly coercive iron-platinum magnets

Author

Listed:
  • Takeshi Seki

    (Institute for Materials Research, Tohoku University)

  • Kazutoshi Utsumiya

    (Institute for Materials Research, Tohoku University)

  • Yukio Nozaki

    (Keio University)

  • Hiroshi Imamura

    (National Institute of Advanced Industrial Science and Technology)

  • Koki Takanashi

    (Institute for Materials Research, Tohoku University)

Abstract

Recent rapid progress in spintronic and magnetic storage nanodevices has required nanomagnets to balance competing goals for high coercive field and low switching field. However, a decisive route for highly efficient magnetization switching has not been established yet. Here we propose a novel switching method using a spin wave of magnetic structures twisted in a nanometre scale. We have experimentally demonstrated extremely low field-magnetization switching in a highly coercive FePt by using a spin wave excited in a soft magnetic permalloy (Ni81Fe19), where permalloy is exchange-coupled to FePt through the interface. We can tune the switching field by varying the magnitude and frequency of the radio frequency magnetic field, and a significant decrease in switching field by one order of magnitude is achieved under the optimum conditions. The spin wave-assisted magnetization switching is a promising technique for ultralow-energy magnetization manipulation.

Suggested Citation

  • Takeshi Seki & Kazutoshi Utsumiya & Yukio Nozaki & Hiroshi Imamura & Koki Takanashi, 2013. "Spin wave-assisted reduction in switching field of highly coercive iron-platinum magnets," Nature Communications, Nature, vol. 4(1), pages 1-6, June.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2737
    DOI: 10.1038/ncomms2737
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