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arXiv 2104.05075cond-mat.mtrl-sci
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金和稀土铁石榴石双层膜界面自旋Seebeck效应的超快测量

Ultrafast Measurements of the Interfacial Spin Seebeck Effect in Au and Rare-Earth Iron Garnet Bilayers

Victor H. Ortiz, Michael J. Gomez, Yawen Liu, Mohammed Aldosary, Jing Shi, Richard B. Wilson

摘要:

我们研究了金/铁石榴石界面上的皮秒自旋电流响应于超快激光加热的Au膜中的电子。在光加热后的皮秒内,由于金属中的电子和绝缘体中的磁振子之间的界面温度差,会出现界面自旋电流。本文报道了Au与稀土铁石榴石绝缘体(RE $_3$ Fe $_5$ O $_{12}$,其中RE为Y,Eu,Tb,Tm)之间界面纵向自旋Seebeck效应的测量结果。我们使用时域热反射(TDTR)的测量来表征超快光加热的双层的热响应。我们使用时间分辨的磁光克尔效应(TR-MOKE)测量的Au层来测量自旋积累的时间演化的Au膜。我们观察到Au/TmIG之间的自旋Seebeck效应是Au/YIG双层的三倍。Au中的电子与TmIG层中的磁振子之间的界面热导为~3 $\frac{MW}{m^2 K}$。

英文摘要:

We investigate picosecond spin-currents across Au/iron-garnet interfaces in response to ultrafast laser heating of the electrons in the Au film. In the picoseconds after optical heating, interfacial spin currents occur due to an interfacial temperature difference between electrons in the metal and magnons in the insulator. We report measurements of this interfacial longitudinal spin Seebeck effect between Au and rare-earth iron-garnet insulators, i.e. RE$_3$ Fe$_5$O$_{12}$, where RE is Y, Eu, Tb, Tm. We use time domain thermoreflectance (TDTR) measurements to characterize the thermal response of the bilayer to ultrafast optical heating. We use time-resolved magneto-optic Kerr effect (TR-MOKE) measurements of the Au layer to measure the time-evolution of spin accumulation in the Au film. We observe a spin Seebeck effect between Au/TmIG that is three times larger than for an Au/YIG bilayer. The interfacial thermal conductance between electrons in the Au and magnons in the TmIG layer is ~ 3 $\frac{MW}{m^2 K}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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