论文标题
通过螺旋性依赖性吸收可见的近红外激光脉冲的磁力逆转PT/CO/PT膜的磁化逆转
Magnetization reversal of a ferromagnetic Pt/Co/Pt film by helicity dependent absorption of visible to near-infrared laser pulses
论文作者
论文摘要
区分磁性圆形二色性和反向法拉第效应的影响的实际困难促进了激烈的争论，这主要驱动了铁磁体中磁化强度的螺旋性依赖性全光切换的过程。在这里，我们使用可见光到近红外光脉冲在PT/CO/PT多层堆栈中定量测量开关过程的效率。我们发现，随着将泵送波长从0.5 $ $ m m增加到1.1 $μ$ m，开关效率提高了8.6倍，在更长的波长下效率为100％，最高为2.0 $μ$ m。我们的实验结果可以通过磁性圆形二色性现象成功地解释，这是朝着解决对铁磁体中磁化反转的全光过程的长期争议迈出的重要一步。
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.
