Spin currents injected electrically and thermally from highly spin polarized Co2MnSi
Spin currents injected electrically and thermally from highly spin polarized Co2MnSi
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DOI：
10.1063/1.4929423
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发表时间：
2015-07
影响因子：
4
通讯作者：
A. Pfeiffer;Shaojie Hu;R. Reeve;Alexander Kronenberg;M. Jourdan;T. Kimura;M. Klaui
中科院分区：
文献类型：
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作者：
A. Pfeiffer;Shaojie Hu;R. Reeve;Alexander Kronenberg;M. Jourdan;T. Kimura;M. Klaui
我们演示了在Co2MnSi/Cu横向自旋阀中探测电和热产生的自旋电流的注入和检测。对不同电极间距的器件进行了非局域信号测量，确定了室温下Co2MnSi的有效自旋极化α为0.63，Cu的自旋扩散长度为500 nm。电产生的非局部信号作为温度的函数进行测量，并在温度为80k时观察到最大信号。在二次谐波测量检测方案中，热产生的非局部信号作为电流密度和温度的函数进行测量。我们发现电和热产生的非局部信号的温度依赖性不同，这使我们能够得出结论，信号的温度依赖性不仅由Cu线中的输运决定，而且还有来自不同类型的关键贡献。
We demonstrate the injection and detection of electrically and thermally generated spin currents probed in Co2MnSi/Cu lateral spin valves. Devices with different electrode separations are patterned to measure the non-local signal as a function of the electrode spacing and we determine a relatively high effective spin polarization α of Co2MnSi to be 0.63 and the spin diffusion length of Cu to be 500 nm at room temperature. The electrically generated non-local signal is measured as a function of temperature and a maximum signal is observed for a temperature of 80 K. The thermally generated non-local signal is measured as a function of current density and temperature in a second harmonic measurement detection scheme. We find different temperature dependences for the electrically and thermally generated non-local signals, which allows us to conclude that the temperature dependence of the signals is not just dominated by the transport in the Cu wire, but there is a crucial contribution from the different gener...