arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.05314cond-mat.mtrl-scicond-mat.mes-hall
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自旋波的布里渊光散射

Brillouin Light Scattering of Spin Waves Inaccessible with Free-Space Light

R. Freeman, R. Lemasters, T. Kalejaiye, F. Wang, G. Chen, J. Ding, M. Wu, V. E. Demidov, S. O. Demokritov, H. Harutyunyan, S. Urazhdin

摘要:

微聚焦布里渊散射是一种用于材料中元激发的光谱和空间表征的强大技术。然而,光的小动量限制了布里渊区中心的可达激发。在这里,我们利用一个金属纳米天线上制作的原型亚铁钇铁石榴石,以证明布里渊光散射的可能性,从大波矢量,高频自旋波激发,是不可访问的自由空间光。该天线有利于电磁场的子衍射约束,这增强了局部场强,并产生明显大于自由空间光的动量分量。我们的方法提供了访问高频自旋波的快速纳米磁性器件的重要性,并可以推广到其他类型的激发和光散射技术。

英文摘要:

Micro-focus Brillouin light scattering is a powerful technique for the spectroscopic and spatial characterization of elementary excitations in materials. However, the small momentum of light limits the accessible excitations to the center of the Brillouin zone. Here, we utilize a metallic nanoantenna fabricated on the archetypal ferrimagnet yttrium iron garnet to demonstrate the possibility of Brillouin light scattering from large-wavevector, high-frequency spin wave excitations that are inaccessible with free-space light. The antenna facilitates sub-diffraction confinement of electromagnetic field, which enhances the local field intensity and generates momentum components significantly larger than those of free-space light. Our approach provides access to high frequency spin waves important for fast nanomagnetic devices, and can be generalized to other types of excitations and light scattering techniques.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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