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arXiv 1806.03151cond-mat.supr-concond-mat.mes-hall
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超导绝对自旋阀

A superconducting absolute spin valve

G. De Simoni, E. Strambini, J. S. Moodera, F. S. Bergeret, F. Giazotto

摘要:

具有自旋分裂激发谱的超导体在隧道结中表现为理想的铁磁自旋注入器。理论预测,两个自旋分裂超导体的组合具有独立可调的磁化强度,可以用作理想的$absolute$自旋阀。在这里,我们报告的第一个开关超导自旋阀的基础上,两个EuS/Al双层耦合通过氧化铝隧道势垒。自旋阀显示了EuS层的平行和反平行配置之间的相对电阻变化高达900%,这表明通过结的高度自旋极化电流。我们的装置可能是关键的实现热电辐射探测器,逻辑元件的存储单元在低温超导计算机和超导自旋电子学一般。

英文摘要:

A superconductor with a spin-split excitation spectrum behaves as an ideal ferromagnetic spin-injector in a tunneling junction. It was theoretical predicted that the combination of two such spin-split superconductors with independently tunable magnetizations, may be used as an ideal $absolute$ spin-valve. Here we report on the first switchable superconducting spin-valve based on two EuS/Al bilayers coupled through an aluminum oxide tunnel barrier. The spin-valve shows a relative resistance change between the parallel and antiparallel configuration of the EuS layers up to 900% that demonstrates a highly spin-polarized currents through the junction. Our device may be pivotal for realization of thermoelectric radiation detectors, logical element for a memory cell in cryogenics superconductor-based computers and superconducting spintronics in general.

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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