Giant enhancement of spin accumulation and long-distance spin precession in metallic lateral spin valves
Giant enhancement of spin accumulation and long-distance spin precession in metallic lateral spin valves
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DOI：
10.1038/nmat3046
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发表时间：
2011-07-01
期刊：
影响因子：
41.2
通讯作者：
Otani, YoshiChika
中科院分区：
文献类型：
--
作者：
Fukuma, Yasuhiro;Wang, Le;Otani, YoshiChika
横向自旋阀中的非局域自旋注入有望成为产生纯自旋流的有效方法，并有可能应用于自旋电子学领域。然而，自旋阀电压，这决定了自旋电流的大小流入一个额外的铁磁线，通常是1 μ V的顺序。在这里，我们表明，横向自旋阀与低电阻率NiFe/MgO/Ag结，使有效的自旋注入高施加的电流密度，这导致自旋阀电压增加100倍。汉勒效应测量表明，长距离集体2 π自旋进动沿着6 μ m长的Ag线。这些结果表明，路线更快和可操纵的自旋输运纯自旋电流为基础的存储器，逻辑和传感设备的发展。
The non-local spin injection in lateral spin valves is strongly expected to be an effective method to generate a pure spin current for potential spintronic application. However, the spin-valve voltage, which determines the magnitude of the spin current flowing into an additional ferromagnetic wire, is typically of the order of 1 mu V. Here we show that lateral spin valves with low-resistivity NiFe/MgO/Ag junctions enable efficient spin injection with high applied current density, which leads to the spin-valve voltage increasing 100-fold. Hanle effect measurements demonstrate a long-distance collective 2 pi spin precession along a 6-mu m-long Ag wire. These results suggest a route to faster and manipulable spin transport for the development of pure spin-current-based memory, logic and sensing devices.