Energy relaxation dynamics in ferromagnetic Co film with femtosecond transient absorption

doi:10.1016/j.optcom.2019.07.024

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	Energy relaxation dynamics in ferromagnetic Co film with femtosecond transient absorption
	P.L.Zhang; Y.H.Yang; A.M.Chen; Y.Shi; Y.P.Wang; L.C.Du; D.J.Ding
	2019
发表期刊	Optics Communications
ISSN	0030-4018
卷号	452 页码:83-87
摘要	Femtosecond time-resolved pump-probe technology has been widely used in studying ultrafast dynamics in various materials. In the present study a Co thin film on MgO, as a typical ferromagnetic material, was selected for investigating the ultrafast energy relaxation dynamics related to spin feature of materials. The energy relaxation dynamics of this thin film was measured by femtosecond transient absorption. The results can be well stimulated by a three-temperature model, in which electron, spin and lattice were involved, indicating that spin plays an important role in the energy relaxation. From this model, the hot electron temperature from the transient absorption under different pumping laser energy was calibrated which can reach 638, 724, 841 and 935 K with the energy of 3.2, 4.3, 6.0 and 7.5 J/m(2) respectively. In additional, three time constants were obtained by a global analysis of the transient absorption, and attributed to electron-spin (250 similar to 350 fs), electron-lattice (10 similar to 20 ps), and spin-lattice interaction (300 similar to 400 ps), respectively. By analyzing the dynamics of the ferromagnetic material after laser excitation, the rich physics governing ultrafast energy relaxation dynamics are elucidated, and the temperature references for femtosecond laser manipulation of this material are provided.
关键词	Femtosecond transient absorption,Energy relaxatio,Three-temperature,model,Electron-spin interaction,Electron-lattice interaction,ultrafast spin dynamics,magnetization dynamics,angular-momentum,electron,excitation,nickel,Optics
DOI	10.1016/j.optcom.2019.07.024
收录类别	SCI ; EI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/62792
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	P.L.Zhang,Y.H.Yang,A.M.Chen,et al. Energy relaxation dynamics in ferromagnetic Co film with femtosecond transient absorption[J]. Optics Communications,2019,452:83-87.
APA	P.L.Zhang.,Y.H.Yang.,A.M.Chen.,Y.Shi.,Y.P.Wang.,...&D.J.Ding.(2019).Energy relaxation dynamics in ferromagnetic Co film with femtosecond transient absorption.Optics Communications,452,83-87.
MLA	P.L.Zhang,et al."Energy relaxation dynamics in ferromagnetic Co film with femtosecond transient absorption".Optics Communications 452(2019):83-87.

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