Spin Dynamics of B2 and L21-Ordered Co2FeAl0.5Si0.5 Heusler Alloy Films

doi:10.1088/0256-307X/28/6/067501

Chinese Physics Letters

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

Spin Dynamics of B2 and L2₁-Ordered Co₂FeAl_0.5Si_0.5 Heusler Alloy Films

Yi Ming (易鸣)¹, Chen Zhi-Feng (陈志峰)², Chen Da-Xin (陈达鑫)², Lai Tian-Shu (赖天树)² and Zhou Shi-Ming (周仕明)^1,4

2011 Chinese Physical Society and IOP Publishing Ltd
Chinese Physics Letters, Volume 28, Number 6 Citation Yi Ming et al 2011 Chinese Phys. Lett. 28 067501 DOI 10.1088/0256-307X/28/6/067501

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¹ Surface Physics Laboratory (National Key Laboratory) and Department of Physics, Fudan University, Shanghai 200433

² State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275

³ Spintronics Group, Magnetic Material Center, National Institute for Materials Science (NIMS), Sengen, Tsukuba, Ibaraki, Japan

⁴ Department of Physics, Tongji University, Shanghai 210093

Dates

Received 7 January 2011

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Abstract

Measurements of magnetization precession are performed for L2₁ and B2-ordered Co₂FeAl_0.5Si_0.5 full Heusler alloy films using the time-resolved magneto-optical Kerr effect technique in the out-of-plan configuration. Dependence of the precession frequency on the external magnetic field can be fitted by the Landau-Lifshitz-Gilbert equation. The chirp parameters are close to each other for the L2₁ and B2 structures, and decrease with the external magnetic field increasing. The relaxation rate of the B2-ordered film is smaller than that of the L2₁ one.

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