Significant change of spin transport property in Cu/Nb bilayer due to superconducting transition.
Significant change of spin transport property in Cu/Nb bilayer due to superconducting transition.
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DOI：
10.1038/srep06260
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发表时间：
2014-09-02
影响因子：
4.6
通讯作者：
Kimura T
中科院分区：
文献类型：
--
作者：
Ohnishi K;Ono Y;Nomura T;Kimura T
自旋相关和超导（SC）输运之间的组合有望提供有趣的特性，如交叉Andreev反射和自旋三重态超导性。这或许能够在自旋电子学领域开辟一条新的途径，即超导自旋电子学，因为超导体本身在未来的纳米电子应用中具有巨大的潜力。为了观察这种SC自旋输运，抑制由电流引起的加热和奥斯特场的非本征效应是至关重要的。不伴随电荷电流的纯自旋电流被认为是防止这种非本征效应的有力手段。然而，不可忽略的热流被发现存在，即使在传统的纯自旋电流器件的基础上横向配置的自旋阀，因为周围的加热自旋注入器。在这里，我们开发了一种基于纳米柱的横向自旋阀，它显着减少了热的产生，在超导铌膜。通过使用这个理想平台，我们发现，自旋吸收强烈抑制的SC跃迁的Nb。这是超导铌是纯自旋电流绝缘体的有力证据。
The combination between the spin-dependent and super-conducting (SC) transports is expected to provide intriguing properties such as crossed Andreev reflection and spin-triplet superconductivity. This may be able to open a new avenue in the field of spintronics, namely superconducting spintronics because a superconductor itself has great potential for future nanoelectronic applications. To observe such SC spin transports, the suppression of the extrinsic effects originating from the heating and Oersted field due to the electric current is a crucial role. Pure spin current without accompanying the charge current is known as a powerful mean for preventing such extrinsic effects. However, non-negligible heat flow is found to exist even in a conventional pure spin current device based on laterally-configured spin valve because of the heating around the spin injector. Here, we develop a nanopillar-based lateral spin valve, which significantly reduces the heat generation, on a superconducting Nb film. By using this ideal platform, we found that the spin absorption is strongly suppressed by the SC transition of Nb. This demonstration is the clear evidence that the super-conducting Nb is an insulator for the pure spin current.
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