TMOKE是超薄磁性薄膜磁光分析的有效工具

O. Borovkova, H. Hashim, M. Kozhaev, S. Dagesyan, A. Chakravarty, M. Levy, V. Belotelov
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引用次数: 56

摘要

超薄磁介质薄膜在纳米光子学和自旋电子学中具有重要的应用价值。在这里,我们提出了一种有效的方法来研究超薄磁性薄膜的磁光特性,使人们能够获得它们的磁化状态和磁光特性。它基于表面等离子体极化辅助的横向磁光克尔效应(TMOKE)。在我们的实验中,我们分析了覆盖在等离子体金光栅上的亚100纳米厚铋取代镥铁石榴石薄膜。表面等离子激元的激发使TMOKE的共振增强达到0.04,使其在实验中易于检测。对于厚度大于40纳米的薄膜,TMOKE与薄膜厚度的关系不大。薄膜厚度的进一步减小减小了TMOKE,因为在这样的厚度下,表面等离子体-极化子场部分渗透到非磁性衬底内部。然而,即使对于几纳米厚的薄膜,TMOKE仍然是可测量的,这使得这种技术在超薄薄膜的磁光研究中是独一无二的。特别地,该方法表明,随着膜厚的减小,磁膜介电常数张量的非对角线分量略有增加。
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TMOKE as efficient tool for the magneto-optic analysis of ultra-thin magnetic films
Ultra-thin magnetic dielectric films are of prime importance due to their applications for nanophotonics and spintronics. Here, we propose an efficient method for the magneto-optical investigation of ultra-thin magnetic films which allows one to access their state of magnetization and magneto-optical properties. It is based on the surface-plasmon-polariton-assisted transverse magneto-optical Kerr effect (TMOKE). In our experiments, sub-100 nm-thick bismuth-substituted lutetium iron-garnet films covered with a plasmonic gold grating have been analyzed. The excitation of surface plasmon-polaritons provides resonance enhancement of TMOKE up to 0.04 and makes it easily detectable in the experiment. For films thicker than 40 nm, the TMOKE marginally depends on the film thickness. A further decrease in the film thickness diminishes TMOKE since for such thicknesses the surface plasmon-polariton field partly penetrates inside the non-magnetic substrate. Nevertheless, the TMOKE remains measurable even for few-nm-thick films, which makes this technique unique for the magneto-optical study of ultra-thin films. Particularly, the proposed method reveals that the off-diagonal components of the magnetic film permittivity tensor grow slightly with the reduction of the film thickness.
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