Transient enhancement of magnetization damping in CoFeB film via pulsed laser excitation

Journal Article · Mon Jul 25 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4959266· OSTI ID:22594440

Liu, Bo; Ruan, Xuezhong; Wu, Zhenyao; He, Liang; Zhang, Rong ^[1]; Tu, Hongqing; Du, Jun ^[2]; Wu, Jing; Lu, Xianyang ^[3]; Xu, Yongbing ^[1]

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1. Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, Jiangsu Provincial Key Laboratory for Nanotechnology, Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093 (China)
2. Department of Physics, Nanjing University, Nanjing 210093 (China)
3. York-Nanjing International Joint Center in Spintronics, Departments of Electronics and Physics, The University of York, York YO10 5DD (United Kingdom)

Laser-induced spin dynamics of in-plane magnetized CoFeB films has been studied by using time-resolved magneto-optical Kerr effect measurements. While the effective demagnetization field shows little dependence on the pump laser fluence, the intrinsic damping constant has been found to be increased from 0.008 to 0.076 with the increase in the pump fluence from 2 mJ/cm{sup 2} to 20 mJ/cm{sup 2}. This sharp enhancement has been shown to be transient and ascribed to the heating effect induced by the pump laser excitation, as the damping constant is almost unchanged when the pump-probe measurements are performed at a fixed pump fluence of 5 mJ/cm{sup 2} after irradiation by high power pump pulses.

• OSTI ID: 22594440
• Journal Information: Applied Physics Letters, Vol. 109, Issue 4; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COBALT BORIDES
DAMPING
DEMAGNETIZATION
EXCITATION
FILMS
HEATING
IRON BORIDES
IRRADIATION
KERR EFFECT
LASERS
MAGNETIZATION
OPTICAL PUMPING
PULSES
SPIN
TIME RESOLUTION
TRANSIENTS