Ultrafast giant magnetic cooling effect in ferromagnetic Co/Pt multilayers

被引：15

作者：

Shim, Je-Ho ^{[1
,2
,3
,4
]}

Syed, Akbar Ali ^{[2
,3
,4
]}

Kim, Chul-Hoon ^{[2
,3
,4
,5
]}

Lee, Kyung Min ^{[6
,7
]}

Park, Seung-Young ^{[8
]}

Jeong, Jong-Ryul ^{[6
,7
]}

Kim, Dong-Hyun ^{[1
]}

Kim, Dong Eon ^{[2
,3
,4
]}

机构：

[1] Chungbuk Natl Univ, Dept Phys, Cheongju 361763, South Korea

[2] POSTECH, Dept Phys, Pohang 790784, South Korea

[3] POSTECH, Ctr Attosecond Sci & Technol, Pohang 790784, South Korea

[4] Max Planck POSTECH KOREA Res Initiat, Max Planck Ctr Attosecond Sci, Pohang 790784, South Korea

[5] Korea Univ, Dept Adv Mat Chem, Sejong 339700, South Korea

[6] Chungnam Natl Univ, Dept Mat Sci & Engn, Daejeon 305764, South Korea

[7] Chungnam Natl Univ, Grad Sch Energy Sci & Technol, Daejeon 305764, South Korea

[8] Korea Basic Sci Inst, Spin Engn Phys Team, Daejeon 305806, South Korea

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

基金：

新加坡国家研究基金会;

关键词：

SPIN-LATTICE-RELAXATION; ELECTRON; DYNAMICS; MAGNETOOPTICS; FEMTOSECOND; HYSTERESIS; ANISOTROPY; NICKEL; FILMS;

D O I：

10.1038/s41467-017-00816-w

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：8

共 48 条

[1] GALVANOMAGNETIC EFFECTS, MAGNETOSTRICTION, AND SPIN-ORBIT INTERACTION IN CU-NI-FE AND OTHER FERROMAGNETIC NICKEL ALLOYS [J].