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arXiv 2307.03326physics.opticscond-mat.mes-hallcond-mat.mtrl-sci
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通过逆法拉第效应实现纳米尺度磁性的等离激元增强光学控制

Plasmon-enhanced optical control of magnetism at the nanoscale via the inverse Faraday effect

Sergii Parchenko, Kevin Hofhuis, Agne Ciuciulkaite, Vassilios Kapaklis, Valerio Scagnoli, Laura Heyderman, Armin Kleibert

AI总结:

本研究通过圆偏振飞秒激光激发金纳米盘产生局部磁场,利用逆法拉第效应实现了对相邻磁性薄膜磁化的超快纳米尺度光学控制,并发现偏离共振波长激发可避免多余加热,为纳米自旋电子器件的光驱动控制提供了新途径。

摘要:

过去一个世纪以来,磁化与光之间的关系一直是深入研究的热点,主要关注磁矩对光偏振的影响。相反,为了实现自旋电子学中磁性的全光学控制,人们正在研究通过偏振光操控磁性的方法。尽管已有关于薄膜和亚微米结构中磁化的单脉冲全光学切换等显著发现的报道,但在纳米尺度上实现磁性的局部光学控制仍然难以实现。在此,我们展示了用圆偏振飞秒激光脉冲激发金纳米盘会产生可观的局部磁场,从而实现对相邻磁性薄膜磁化的超快局部控制。此外,我们发现,在大于金纳米盘实际等离激元共振的波长下激发样品时,会产生最高磁场,从而避免了因吸收而产生的不必要加热效应。我们的研究为纳米尺度自旋电子器件中的光驱动控制铺平了道路,并为等离激元纳米结构中磁场的产生提供了重要见解。

英文摘要:

The relationship between magnetization and light has been the subject of intensive research for the past century, focusing on the impact of magnetic moments on light polarization. Conversely, the manipulation of magnetism through polarized light is being investigated to achieve all-optical control of magnetism in spintronics. While remarkable discoveries such as single pulse all-optical switching of the magnetization in thin films and sub-micrometer structures have been reported, the demonstration of local optical control of magnetism at the nanoscale has remained elusive. Here, we show that exciting gold nanodiscs with circularly polarized femtosecond laser pulses leads to the generation of sizeable local magnetic fields that enable ultrafast local control of the magnetization of an adjacent magnetic film. In addition, we find that the highest magnetic fields are generated when exciting the sample at a wavelength larger than that of the actual plasmonic resonance of the gold nanodiscs, so avoiding undesired heating effects due to absorption. Our study paves the way for light-driven control in nanoscale spintronic devices and provides important insights into the generation of magnetic fields in plasmonic nanostructures.

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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