Remotely induced magnetism in a normal metal using a superconducting spin-valve
Remotely induced magnetism in a normal metal using a superconducting spin-valve
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DOI：
10.1038/nphys3486
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发表时间：
2016-01-01
期刊：
影响因子：
19.6
通讯作者：
Lee, S. L.
中科院分区：
文献类型：
--
作者：
Flokstra, M. G.;Satchell, N.;Lee, S. L.
超导自旋电子学在过去的十年中已经成为一个很有前途的新领域，它试图通过利用超导库珀对的内部自旋结构作为一个新的自由度(1，2)来打开纳米电子学的新维度。它的基本构件是具有等向自旋的自旋三重态库珀对，这是通过传统超导体接近具有不均匀宏观磁化的铁磁材料来促进的(3)。利用低能Muon自旋旋转实验，我们发现了一个与现有超导和铁磁性理论模型相矛盾的意外效应：在非磁性金属(金)的薄层中出现磁化，该薄层由50 nm厚的Nb超导层与铁磁双层隔开。这种效应既可以通过温度控制，也可以通过使用磁场控制远程铁磁元件的状态来控制，并且可以作为基于库珀对自旋的新一代量子干涉器件的基本构建块。
Superconducting spintronics has emerged in the past decade as a promising new field that seeks to open a new dimension for nanoelectronics by utilizing the internal spin structure of the superconducting Cooper pair as a new degree of freedom(1,2). Its basic building blocks are spin-triplet Cooper pairs with equally aligned spins, which are promoted by proximity of a conventional superconductor to a ferromagnetic material with inhomogeneous macroscopic magnetization(3). Using low-energy muon spin-rotation experiments we find an unanticipated effect, in contradiction with the existing theoretical models of superconductivity and ferromagnetism: the appearance of a magnetization in a thin layer of a non-magnetic metal (gold), separated from a ferromagnetic double layer by a 50-nm-thick superconducting layer of Nb. The effect can be controlled either by temperature or by using a magnetic field to control the state of the remote ferromagnetic elements, and may act as a basic building block for a new generation of quantum interference devices based on the spin of a Cooper pair.