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Spin diffusion and non-local spin-valve effect in an exfoliated multilayer graphene with a Co electrode

机译:具有Co电极的片状多层石墨烯的自旋扩散和非局部自旋阀效应

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We fabricated a non-local spin valve with a thin layer of graphite with Co transparent electrodes. The spin-valve effect and spin precession were observed at room temperature. The magnitude of the mangetoresistance increases when temperature decreases. The spin-relaxation time, tau(s), obtained from the fitting of the Hanle curves increases with decreasing temperature with a weak dependence similar to T-0.065 while the spin-diffusion constant D decreases. At room temperature, tau(s) exceeds 100 ps and the spin-diffusion length, lambda(s), is similar to 2 mu m. The temperature dependence of lambda(s) is not monotonic, and it has the largest value at room temperature. Our results show that multilayer graphene is a suitable material for spintronic devices.
机译:我们制造了一个带有Co透明电极的薄石墨层的非局部自旋阀。在室温下观察到自旋阀效应和自旋进动。当温度降低时,抗磁强度增加。通过Hanle曲线的拟合获得的自旋弛豫时间tau(s)随着温度的降低而增加,其依赖性类似于T-0.065,而自旋扩散常数D则降低。在室温下,tau超过100 ps,并且自旋扩散长度lambda接近2微米。 λ的温度依赖性不是单调的,并且在室温下具有最大值。我们的结果表明,多层石墨烯是自旋电子器件的合适材料。

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