Optical inter-site spin transfer probed by energy and spin-resolved transient absorption spectroscopy
Optical inter-site spin transfer probed by energy and spin-resolved transient absorption spectroscopy
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DOI：
10.1038/s41467-020-14691-5
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发表时间：
2020-02-13
影响因子：
16.6
通讯作者：
Eisebitt, Stefan
中科院分区：
文献类型：
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作者：
Willems, Felix;Schmising, Clemens von Korff;Eisebitt, Stefan
光学驱动的自旋输运是操纵宏观磁化的最快和最有效的过程，因为它不依赖于次级机制来耗散角动量。在目前的工作中，我们表明，这样的光学站点间自旋转移（OISTR）从Pt到Co出现作为一个主导机制的CoPt合金的超快磁化动力学。为了证明这一点，我们进行了联合的理论和实验研究，以确定在极紫外光谱范围内的螺旋度依赖的吸收的瞬态变化。我们表明，螺旋度依赖的吸收是直接相关的瞬态自旋分裂态密度的变化，使我们能够链接的OISTR的起源到费米能级以上的可用少数状态。这使得OISTR成为多组分磁系统光学操纵中的普遍现象。
Optically driven spin transport is the fastest and most efficient process to manipulate macroscopic magnetization as it does not rely on secondary mechanisms to dissipate angular momentum. In the present work, we show that such an optical inter-site spin transfer (OISTR) from Pt to Co emerges as a dominant mechanism governing the ultrafast magnetization dynamics of a CoPt alloy. To demonstrate this, we perform a joint theoretical and experimental investigation to determine the transient changes of the helicity dependent absorption in the extreme ultraviolet spectral range. We show that the helicity dependent absorption is directly related to changes of the transient spin-split density of states, allowing us to link the origin of OISTR to the available minority states above the Fermi level. This makes OISTR a general phenomenon in optical manipulation of multi-component magnetic systems.