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YIG/Pt异质结中自旋塞贝克效应研究进展
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Abstract:
自旋塞贝克效应(SSE)作为产生纯自旋流的一种方式在信息传输、存储及新能源开发和废热利用方面有着广阔的应用前景，但产生的自旋流较弱是这一效应不能广泛应用的最大障碍。研究发现在铁磁绝缘体钇铁石榴石(YIG)中，由SSE产生的自旋流弛豫时间更长且不易受其它效应的影响，所以研究由SSE所产生的自旋流在YIG中的传播尤为重要。本文主要从两个部分概述了SSE所产生自旋流在YIG/Pt异质结的研究现状。第一部分是YIG/Pt异质结中自旋流产生和传播的理论机制，主要从磁振子模型和磁振子–声子相互作用两个角度描述。第二部分是通过对YIG/Pt界面的修饰来提高自旋混合传导，从而提高Pt中探测到的自旋流。
The spin Seebeck effect (SSE), as a way to generate pure spin current, has broad application prospects in information transmission, storage and new energy development and waste heat utilization, but the resulting spin current is weak. In the ferromagnetic insulator yttrium garnet (YIG), the SSE produces a longer spin-flow relaxation time and is less susceptible to contamination by other effects. Therefore, it is particularly important to study the propagation of spin current generated by SSE in YIG. This paper mainly summarizes the research status of STE-generated spin currents in YIG/Pt heterojunctions from two parts. On the one hand, it is the theoretical mechanism of the generation and propagation of spin current in the YIG/Pt heterojunction, which is mainly described from the two aspects of the magnon model and the magnon-phonon interaction. The other part is to improve the spin-mixed conduction by modifying the YIG/Pt interface, thereby increasing the spin current detected in Pt.
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