Manipulation of ultrafast demagnetization dynamics by optically induced intersite spin transfer in magnetic compounds with distinct density of states
Manipulation of ultrafast demagnetization dynamics by optically induced intersite spin transfer in magnetic compounds with distinct density of states
复制标题
通过具有不同状态密度的磁性化合物中的光诱导位点间自旋转移来操纵超快退磁动力学
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
S. Eisebitt
中科院分区：
文献类型：
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作者：
M. Borchert;C. V. K. Schmising;D. Schick;D. Engel;Sangeeta Sharma;S. Eisebitt
在飞秒时间尺度上的磁化动力学的光学控制对于未来的快速和节能的磁存储介质的改进是相关的。在这里，我们提出了一个系统的比较超快的磁响应之间的3D铁磁体（FM），铁，钴，镍，和各自的铂基合金和多层膜（ML）提供新的见解最近理论预测的光诱导位间自旋转移（OISTR）。在FMPt合金和FM| Pt MLs的光激光激发导致自旋电流占主导地位的少数载流子从Pt的FM亚晶格，显着提高效率的退磁幅度。我们建议这种转移是依赖于可用的，未占用的状态在自旋漏极（FM亚晶格）的数量，并显示未占用的少数3d状态的数量之间的定量相关性高于费米能级的每个FM和相应的增强后，加入Pt作为自旋供体的退磁幅度。我们提供支持这一假设的磁光克尔效应测量飞秒时间分辨率，以及从头计算模拟的基础上含时密度泛函理论。我们的研究拓宽了状态工程密度的路径，以积极影响退磁效率，特别是在但不限于低于一百飞秒的时间尺度上。
Optical control of magnetization dynamics on a femtosecond time scale is of relevance for the improvement of future, fast and energy-efficient magnetic storage media. Here, we present a systematic comparison of the ultrafast magnetic response between the 3d ferromagnets (FMs), Fe, Co, and Ni, and their respective Pt-based alloys and multilayers (MLs) to provide new insights into the recently theoretically predicted optically induced intersite spin transfer (OISTR). In the FMPt alloys and FM|Pt MLs optical laser excitation leads to a spin current dominated by minority carriers from the Pt to the FM sublattice, significantly enhancing the efficiency of the demagnetization amplitude. We propose this transfer to be dependent on the number of available, unoccupied states at the spin-drain (FM sublattice) and show a quantitative correlation between the number of unoccupied minority 3d states above the Fermi level of each FM and the respective enhancement of the demagnetization amplitude upon adding Pt as a spin donor. We provide support for this hypothesis by magneto-optical Kerr effect measurements with femtosecond time resolution, as well as by ab-initio simulations based on time-dependent density functional theory. Our study widens the path towards density of states-engineering in order to actively influence the demagnetization efficiency, especially on, but not limited to, timescales below one hundred femtoseconds.
影响因子：
13.6
作者：
Eich S;Plötzing M;Rollinger M;Emmerich S;Adam R;Chen C;Kapteyn HC;Murnane MM;Plucinski L;Steil D;Stadtmüller B;Cinchetti M;Aeschlimann M;Schneider CM;Mathias S
通讯作者：
Mathias S
影响因子：
38.3
作者：
Kampfrath, T.;Battiato, M.;Muenzenberg, M.
通讯作者：
Muenzenberg, M.
影响因子：
35
作者：
Seifert, T.;Jaiswal, S.;Kampfrath, T.
通讯作者：
Kampfrath, T.