Role of electron and phonon temperatures in the helicity-independent all-optical switching of GdFeCo

被引：77

作者：

Gorchon, J. ^{[1
,2
]}

Wilson, R. B. ^{[1
,2
,3
,4
]}

Yang, Y. ^{[5
]}

Pattabi, A. ^{[2
]}

Chen, J. Y. ^{[6
]}

He, L. ^{[6
]}

Wang, J. P. ^{[6
]}

Li, M. ^{[6
]}

Bokor, J. ^{[1
,2
]}

机构：

[1] Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA

[3] Univ Calif Riverside, Dept Mech Engn, Riverside, CA 92521 USA

[4] Univ Calif Riverside, Mat Sci & Engn Program, Riverside, CA 92521 USA

[5] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[6] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 18期

关键词：

ULTRAFAST; FILMS; DYNAMICS; REVERSAL;

D O I：

10.1103/PhysRevB.94.184406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ultrafast optical heating of the electrons in ferrimagnetic metals can result in all-optical switching (AOS) of the magnetization. Here we report quantitative measurements of the temperature rise of GdFeCo thin films during helicity-independent AOS. Critical switching fluences are obtained as a function of the initial temperature of the sample and for laser pulse durations from 55 fs to 15 ps. We conclude that nonequilibrium phenomena are necessary for helicity-independent AOS, although the peak electron temperature does not play a critical role. Pump-probe time-resolved experiments show that the switching time increases as the pulse duration increases, with 10 ps pulses resulting in switching times of similar to 13 ps. These results raise new questions about the fundamental mechanism of helicity-independent AOS.

引用

页数：7

共 37 条

[1] Optimal electron, phonon, and magnetic characteristics for low energy thermally induced magnetization switching [J].

Atxitia, U. ;

Ostler, T. A. ;

Chantrell, R. W. ;

Chubykalo-Fesenko, O. .

APPLIED PHYSICS LETTERS, 2015, 107 (19)

[2] Two-magnon bound state causes ultrafast thermally induced magnetisation switching [J].

Barker, J. ;

Atxitia, U. ;

Ostler, T. A. ;

Hovorka, O. ;

Chubykalo-Fesenko, O. ;

Chantrell, R. W. .

SCIENTIFIC REPORTS, 2013, 3

[3] Superdiffusive Spin Transport as a Mechanism of Ultrafast Demagnetization [J].

Battiato, M. ;

Carva, K. ;

Oppeneer, P. M. .

PHYSICAL REVIEW LETTERS, 2010, 105 (02)

[4] Ultrafast spin dynamics in ferromagnetic nickel [J].

Beaurepaire, E ;

Merle, JC ;

Daunois, A ;

Bigot, JY .

PHYSICAL REVIEW LETTERS, 1996, 76 (22) :4250-4253

[5] Ultrafast electron dynamics at metal surfaces: Competition between electron-phonon coupling and hot-electron transport [J].

Bonn, M ;

Denzler, DN ;

Funk, S ;

Wolf, M ;

Wellershoff, SS ;

Hohlfeld, J .

PHYSICAL REVIEW B, 2000, 61 (02) :1101-1105

[6] All-thermal switching of amorphous Gd-Fe alloys: Analysis of structural properties and magnetization dynamics [J].

Chimata, Raghuveer ;

Isaeva, Leyla ;

Kadas, Krisztina ;

Bergman, Anders ;

Sanyal, Biplab ;

Mentink, Johan H. ;

Katsnelson, Mikhail I. ;

Rasing, Theo ;

Kirilyuk, Andrei ;

Kimel, Alexey ;

Eriksson, Olle ;

Pereiro, Manuel .

PHYSICAL REVIEW B, 2015, 92 (09)

[7]

Dunlop D.J., 1997, Rock magnetism: fundamentals and frontiers, V3

[8] Magneto-optics in the ultrafast regime: Thermalization of spin populations in ferromagnetic films [J].

Guidoni, L ;

Beaurepaire, E ;

Bigot, JY .

PHYSICAL REVIEW LETTERS, 2002, 89 (01)

[9] All-optical switching of magnetoresistive devices using telecom-band femtosecond laser [J].

He, Li ;

Chen, Jun-Yang ;

Wang, Jian-Ping ;

Li, Mo .

APPLIED PHYSICS LETTERS, 2015, 107 (10)

[10]

Hecht E., 2002, OPTICS, P19

← 1 2 3 4 →