Ultrafast giant magnetic cooling effect in ferromagnetic Co/Pt multilayers
SCIE
SCOPUS
- Title
- Ultrafast giant magnetic cooling effect in ferromagnetic Co/Pt multilayers
- Authors
- Shim, Je-Ho; Syed, Akbar Ali; Kim, Chul-Hoon; Lee, Kyung Min; Park, Seung-Young; Jeong, Jong-Ryul; Kim, Dong-Hyun; Kim, Dong Eon
- Date Issued
- 2017-10
- Publisher
- Nature Publishing Group
- 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 nanomultilayers 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/92008
- DOI
- 10.1038/s41467-017-00816-w
- ISSN
- 2041-1723
- Article Type
- Article
- Citation
- Nature Communications, vol. 8, 2017-10
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