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arXiv 1806.04764cond-mat.mes-hall
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磁等离子体双层膜中laser短脉冲激发的共振自旋波

Resonant spin wave excitation in magnetoplasmonic bilayers by short laser pulses

Stanislav Kolodny, Dmitry Yudin, Ivan Iorsh

摘要:

在磁有序固体中,横向磁光克尔效应(TMOKE)可以产生静态磁场。此外,后者被证明是显着增强,由于在纳米结构中的表面等离子体激元的光激发与相对较小的光学损耗。本文提出了一种新的共振光激发方法,在由带光栅的贵金属(Au)和铁磁薄膜钇铁石榴石(YIG)组成的双层膜中,通过频率梳实现共振光激发。基于磁化动力学模拟,我们表明,当频率梳的参数选择为与YIG的自旋波激发共振时,TMOKE显著增强,暗示了自旋电子学系统的光学控制中可能的技术应用。

英文摘要:

In magnetically ordered solids a static magnetic field can be generated by virtue of the transverse magneto-optical Kerr effect (TMOKE). Moreover, the latter was shown to be dramatically enhanced due to the optical excitation of surface plasmons in nanostructures with relatively small optical losses. In this paper we suggest a new method of resonant optical excitations in a prototypical bilayer composed of noble metal (Au) with grating and a ferromagnet thin film of yttrium iron garnet (YIG) via frequency comb. Based on magnetization dynamics simulations we show that for the frequency comb with the parameters, chosen in resonant with spin-wave excitations of YIG, TMOKE is drastically enhanced, hinting towards possible technological applications in the optical control of spintronics systems.

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