Terahertz Emission of Ferromagnetic Ni-Fe Thin Films Excited by Ultrafast Laser Pulses

作     者：SHEN Jian ZHANG Huai-Wu LI Yuan-Xun 沈健;张怀武;李元勋

作者机构：State Key Laboratory of Electronic Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2012年第29卷第6期

页      面：265-267页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0803[工学-光学工程] 

基　　金：Supported by the Fund for Innovative Research Groups of the National Natural Science Foundation of China(61021061) the National Basic Research Program of China under Grant No 2012CB933104 the Youth Fund of the National Natural Science Foundation of China(No 61001025) the Scientific Fund for College(No ZYGX2011X006) the Fund of Guangdong Province for Research and Industrialization(No 2010B090400314) the Opening Fund of State Key Laboratory(KFJJ201102) the Fund of Key Laboratory of Education Ministry 

主　　题：pumping film magnetic 

摘      要：It is believed that the ultrafast demagnetization process in ferromagnetic film is intrinsically a thermal effect,which is induced by ultrafast laser *** present experimental evidence that such ultrafast demagnetization of the NiFe thin film can radiate electromagnetic waves in the terahertz *** also demonstrate that the magnitude of the terahertz electromagnetic pulse emitted from ferromagnetic films alter pulsed laser excitation can be tuned by the Gilbert damping factor α,which is conventionally used to describe damping of GHz precession motion of *** damping factors are obtained by varying the normal metal film adjacent to the magnetic film via spin *** measured radiated electric field in the far field is found to be proportional to the Gilbert damping factor.