Ultrafast giant magnetic cooling effect in ferromagnetic Co/Pt multilayers

Je-Ho Shim, Akbar Ali Syed, Chul-Hoon Kim, Kyung Min Lee, Seung-Young Park, Jong-Ryul Jeong, Dong-Hyun Kim () and Dong Eon Kim ()
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Je-Ho Shim: Chungbuk National University
Akbar Ali Syed: POSTECH
Chul-Hoon Kim: POSTECH
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

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-00816-w

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