通过可见光至近红外激光脉冲的螺旋度依赖吸收实现铁磁 Pt/Co/Pt 薄膜的磁化反转
Magnetization reversal of a ferromagnetic Pt/Co/Pt film by helicity dependent absorption of visible to near-infrared laser pulses
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中文总结 AI 辅助
针对铁磁体全光磁化切换机制的争议，本文通过可见至近红外光脉冲测量 Pt/Co/Pt 多层膜的切换效率，发现随泵浦波长增加效率显著提升至 100%，证实磁圆二色性是主要驱动机制。
中文摘要 AI 辅助
区分磁圆二色性和逆法拉第效应影响的实际困难，引发了关于哪种机制主要驱动铁磁体中螺旋度依赖的全光磁化切换过程的激烈争论。在此，我们使用可见光至近红外光脉冲，定量测量了 Pt/Co/Pt 多层堆叠中切换过程的效率。我们发现，将泵浦波长从 0.5 $ μ$m 增加到 1.1 $ μ$m 时，切换效率提高了 8.6 倍，在长达 2.0 $ μ$m 的更长波长下效率达到 100%。我们的实验结果可通过磁圆二色性现象成功解释，这朝着解决关于铁磁体磁化反转全光过程起源的长期争议迈出了重要一步。
英文摘要
The practical difficulty in distinguishing the impact of magnetic circular dichroism and the inverse Faraday effect fuels intense debates over which mechanism predominantly drives the process of helicity dependent all-optical switching of magnetization in ferromagnets. Here, we quantitatively measure the efficiency of the switching process in a Pt/Co/Pt multilayered stack using visible- to near-infrared optical pulses. We find that the switching efficiency increases by a factor of 8.6 upon increasing the pumping wavelength from 0.5 $ μ$m to 1.1 $ μ$m, becoming 100 % efficient at even longer wavelengths up to 2.0 $ μ$m. Our experimental results can be successfully explained by the phenomenon of magnetic circular dichroism, making a significant step towards resolving the long-standing controversy over the origin of the all-optical process of magnetization reversal in ferromagnets.
