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Ultrafast giant magnetic cooling effect in ferromagnetic Co/Pt multilayers

Author

Listed:
  • Je-Ho Shim

    (Chungbuk National University
    POSTECH
    Max Planck Center for Attosecond Science, Max Planck POSTECH/KOREA Research Initiative)

  • Akbar Ali Syed

    (POSTECH
    Max Planck Center for Attosecond Science, Max Planck POSTECH/KOREA Research Initiative)

  • Chul-Hoon Kim

    (POSTECH
    Max Planck Center for Attosecond Science, Max Planck POSTECH/KOREA Research Initiative
    Korea University)

  • Kyung Min Lee

    (Chungnam National University)

  • Seung-Young Park

    (Spin Engineering Physics Team, Korea Basic Science Institute)

  • Jong-Ryul Jeong

    (Chungnam National University)

  • Dong-Hyun Kim

    (Chungbuk National University)

  • Dong Eon Kim

    (POSTECH
    Max Planck Center for Attosecond Science, Max Planck POSTECH/KOREA Research Initiative)

Abstract

The magnetic cooling effect originates from a large change in entropy by the forced magnetization alignment, which has long been considered to be utilized as an alternative environment-friendly cooling technology compared to conventional refrigeration. However, an ultimate timescale of the magnetic cooling effect has never been studied yet. Here, we report that a giant magnetic cooling (up to 200 K) phenomenon exists in the Co/Pt nano-multilayers on a femtosecond timescale during the photoinduced demagnetization and remagnetization, where the disordered spins are more rapidly aligned, and thus magnetically cooled, by the external magnetic field via the lattice-spin interaction in the multilayer system. These findings were obtained by the extensive analysis of time-resolved magneto-optical responses with systematic variation of laser fluence as well as external field strength and direction. Ultrafast giant magnetic cooling observed in the present study can enable a new avenue to the realization of ultrafast magnetic devices.

Suggested Citation

  • Je-Ho Shim & Akbar Ali Syed & Chul-Hoon Kim & Kyung Min Lee & Seung-Young Park & Jong-Ryul Jeong & Dong-Hyun Kim & Dong Eon Kim, 2017. "Ultrafast giant magnetic cooling effect in ferromagnetic Co/Pt multilayers," Nature Communications, Nature, vol. 8(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-00816-w
    DOI: 10.1038/s41467-017-00816-w
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    Cited by:

    1. Quentin Remy & Julius Hohlfeld & Maxime Vergès & Yann Le Guen & Jon Gorchon & Grégory Malinowski & Stéphane Mangin & Michel Hehn, 2023. "Accelerating ultrafast magnetization reversal by non-local spin transfer," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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