Spin Dynamics across Metallic Layers on the Few-Femtosecond Timescale,Physical Review Letters

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Spin Dynamics across Metallic Layers on the Few-Femtosecond Timescale
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-09-06 , DOI: 10.1103/physrevlett.133.106902
Romain Géneaux _{1,

2,

2} , Hung-Tzu Chang ₁ , Alexander Guggenmos ₁ , Renaud Delaunay ₃ , François Légaré ₄ , Katherine Légaré ₄ , Jan Lüning ₅ , Tymur Parpiiev ₁ , Ilana J. P. Molesky ₁ , Bethany R. de Roulet ₁ , Michael W. Zuerch _{1,

6} , Sangeeta Sharma _{7,

8} , Martin Schultze ₉ , Stephen R. Leone _{1,

1,

6}

Affiliation

We measure the light-driven response of a magnetic multilayer structure made of thin alternating layers of cobalt and platinum at the few-femtosecond timescale. Using attosecond magnetic circular dichroism, we observe how light rearranges the magnetic moment during and after excitation. The results reveal a sub-5 fs spike of magnetization in the platinum layer, which follows the shape of the driving pulse. With the help of time-dependent density functional theory, we interpret the observations as light-driven spin injection across the metallic layers of the structure. The light-triggered spin current is strikingly short, largely outpacing decoherence and dephasing. The findings suggest that the ability of shaping light fields in refined ways could be translated into shaping new forms of spin currents in materials.

中文翻译：

几飞秒时间尺度上金属层的自旋动力学

我们在几飞秒的时间尺度上测量由钴和铂交替薄层制成的磁性多层结构的光驱动响应。利用阿秒磁圆二色性，我们观察光在激发期间和激发后如何重新排列磁矩。结果显示，铂层中的磁化峰值低于 5 fs，遵循驱动脉冲的形状。在瞬态密度泛函理论的帮助下，我们将观察结果解释为光驱动的自旋注入穿过结构的金属层。光触发的自旋电流非常短，大大超过了退相干和移相。研究结果表明，以精细方式塑造光场的能力可以转化为塑造材料中新形式的自旋电流。

更新日期：2024-09-06

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