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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.
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Keywords:
- circularly polarized laser /
- inverse Faraday effect /
- free electrons /
- paramagnetism
[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 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 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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[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 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 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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