Spin injection, diffusion, and detection in lateral spin-valves

被引:130
作者
Ji, Y
Hoffmann, A
Jiang, JS
Bader, SD
机构
[1] Argonne Natl Lab, Div Sci Mat, Argonne, IL 60439 USA
[2] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA
关键词
D O I
10.1063/1.1841455
中图分类号
O59 [应用物理学];
学科分类号
摘要
We demonstrate the injection of spin-polarized electrons into paramagnetic Au nanowires by driving an electric current from a ferromagnetic permalloy (Py) electrode. The nonequilibrium spin accumulation in Au results in a difference between the chemical potentials for spin-up and spin-down electrons that is detected as a field-dependent voltage signal using a second Py electrode. The magnitude of the voltage contrast (>10%) and its coincidence with the magnetic switching of the Py electrodes attest to the spin-sensitive origin of the signals. By increasing the separation of the Py injector and detector, we observe an exponential decay of the spin signals. The measurements yield a spin-diffusion length of 63+/-15 nm and an injected spin polarization of 3% in Au at 10 K. (C) 2004 American Institute of Physics.
引用
收藏
页码:6218 / 6220
页数:3
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