铁磁薄膜中圆偏振光感应的瞬态磁光Kerr峰的物理起源

陈达鑫; 陈志峰; 徐初东; 赖天树

doi:10.7498/aps.59.7362

摘要

使用飞秒时间分辨抽运-探测磁光Kerr光谱技术,实验研究了圆偏振光抽运面内磁化FePt和垂直磁化GdFeCo薄膜的磁化演化动力学,发现在时间延迟零点处均出现瞬态Kerr峰.分析了此Kerr峰的起源,指出此瞬态Kerr峰与铁磁性无关,可能起源于自由电子的顺磁磁化,而顺磁磁化的外磁场来自圆偏振抽运光的逆Faraday效应.基于顺磁磁化模型的计算结果支持此观点.基于此观点,逆Faraday效应感应的磁场脉冲宽度应该与激光脉冲宽度一致.

关键词:

Abstract

The magnetization dynamics of in-plane anisotropic FePt and perpendicularly anisotropic GdFeCo films induced by circularly polarized laser excitation is investigated using femtosecond time-resolved pump-probe Kerr spectroscopy. It is found that a transient Kerr peak occurs near zero-time delay, respectively for each sample. The origin of the peaks is analyzed. It is pointed out that the transient Kerr peaks are not related to ferromagnetism and may originate from paramagnetic magnetization of free electrons in the samples, while the magnetic field that magnetizes the free electrons comes from inverse Faraday effect of the circularly polarized pump laser. The calculation results based on the paramagnetic magnetization model support such a viewpoint. Based on our points, the duration of magnetic pulses induced by inverse Faraday effect should be the same as that of the pump laser pulses.

Keywords:

作者及机构信息

1.
中山大学光电材料与技术国家重点实验室,物理科学与工程技术学院,广州 510275

基金项目: 国家自然科学基金(批准号:60490295,60678009,10874247)、高等学校博士学科点专项科研基金(批准号:20090171110005)和广东省自然科学基金(批准号:9151027501000077)资助的课题.

Authors and contacts

1.
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China

参考文献

[1]	Van der Ziel J P, Pershan P S, Malmstrom L D 1965 Phys. Rev. Lett. 15 190
[2]	Stanciu C D, Hansteen F, Kimel A V, Kirilyuk A, Tsukamoto A, Itoh A, Rasing Th 2007 Phys. Rev. Lett. 99 047601
[3]	Hohlfeld J, Stanciu C D, Rebei A 2009 Appl. Phys. Lett. 94 152504
[4]	Vahaplar K, Kalashnikova A M, Kimel A V, Hinzke D, Nowak U, Chantrell R, Tsukamoto A, Itoh A, Kirilyuk A, Rasing Th 2009 Phys. Rev. Lett. 103 117201
[5]	Wilks R, Hicken R J, Ali M, Hickey B J, Buchanan J D R, Pym A T G, Tanner B K 2004 J. Appl. Phys. 95 7441
[6]	Dalla Longa F, Kohlhepp J T, de Jonge W J M, Koopmans B 2007 Phys. Rev. B 75 224431
[7]	Zhang G P, George T F 2008 Phys. Rev. B 78 052407
[8]	Kruglyak V V, Hicken R J, Ali M, Hickey B J, Pym A T G, Tanner B K 2005 J. Opt. A: Pure Appl. Opt. 7 S235
[9]	Wilks R, Hicken R J 2004 J. Phys: Condens. Matter 16 4607
[10]	Koopmans B, Haverkort J E M, de Jonge W J M, Karczewski G 1999 J. Appl. Phys. 85 6763
[11]	Wang S H, Zha C L, Gao J, Ma B, Zhang Z Z, Jin Q Y 2007 Acta Phys. Sin. 56 1719 (in Chinese)[王淑华、査超麟、高静、马斌、张宗芝、金庆原 2007 物理学报 56 1719]
[12]	Gao R X, Xu Z, Chen D X, Xu C D, Chen Z F, Liu X D, Zhou S M, Lai T S 2009 Acta Phys. Sin. 58 580(in Chinese)[高瑞鑫、徐振、陈达鑫、徐初东、陈志峰、刘晓东、周仕明、赖天树 2009 物理学报 58 580]
[13]	Kimel A V, Kirilyuk A, Usachev P A, Pisarev R V, Balbashov A M, Rasing T 2005 Nature 435 655
[14]	Pauli W 1927 Z. f. Physik 41 81
[15]	Landau L 1930 Z. f. Physik 64 629

施引文献

[1]	Van der Ziel J P, Pershan P S, Malmstrom L D 1965 Phys. Rev. Lett. 15 190
[2]	Stanciu C D, Hansteen F, Kimel A V, Kirilyuk A, Tsukamoto A, Itoh A, Rasing Th 2007 Phys. Rev. Lett. 99 047601
[3]	Hohlfeld J, Stanciu C D, Rebei A 2009 Appl. Phys. Lett. 94 152504
[4]	Vahaplar K, Kalashnikova A M, Kimel A V, Hinzke D, Nowak U, Chantrell R, Tsukamoto A, Itoh A, Kirilyuk A, Rasing Th 2009 Phys. Rev. Lett. 103 117201
[5]	Wilks R, Hicken R J, Ali M, Hickey B J, Buchanan J D R, Pym A T G, Tanner B K 2004 J. Appl. Phys. 95 7441
[6]	Dalla Longa F, Kohlhepp J T, de Jonge W J M, Koopmans B 2007 Phys. Rev. B 75 224431
[7]	Zhang G P, George T F 2008 Phys. Rev. B 78 052407
[8]	Kruglyak V V, Hicken R J, Ali M, Hickey B J, Pym A T G, Tanner B K 2005 J. Opt. A: Pure Appl. Opt. 7 S235
[9]	Wilks R, Hicken R J 2004 J. Phys: Condens. Matter 16 4607
[10]	Koopmans B, Haverkort J E M, de Jonge W J M, Karczewski G 1999 J. Appl. Phys. 85 6763
[11]	Wang S H, Zha C L, Gao J, Ma B, Zhang Z Z, Jin Q Y 2007 Acta Phys. Sin. 56 1719 (in Chinese)[王淑华、査超麟、高静、马斌、张宗芝、金庆原 2007 物理学报 56 1719]
[12]	Gao R X, Xu Z, Chen D X, Xu C D, Chen Z F, Liu X D, Zhou S M, Lai T S 2009 Acta Phys. Sin. 58 580(in Chinese)[高瑞鑫、徐振、陈达鑫、徐初东、陈志峰、刘晓东、周仕明、赖天树 2009 物理学报 58 580]
[13]	Kimel A V, Kirilyuk A, Usachev P A, Pisarev R V, Balbashov A M, Rasing T 2005 Nature 435 655
[14]	Pauli W 1927 Z. f. Physik 41 81
[15]	Landau L 1930 Z. f. Physik 64 629

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