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Energy dispersion of tunnel spin polarization extracted from thermal and electrical spin currents

机译：从热和电自旋电流提取的隧道自旋极化的能量色散

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摘要

The energy dispersion of the tunnel spin polarization of ferromagnetic tunnel contacts (Co_(70)Fe_(30)/MgO) to semiconductors (silicon and germanium) has been extracted from thermal and electrical spin currents. It is demonstrated that the variation of thermal and electrical spin currents with bias voltage can be described simultaneously using the same energy dispersion of the tunnel spin polarization, whereby the electrical spin current is determined by the value of the tunnel spin polarization, whereas the energy derivative of the polarization determines the thermal spin current. Variations in the behavior of the spin currents for different devices can be correlated to the degree of energy dispersion of the tunnel spin polarization. It is also shown that the application of a modest voltage can switch the thermal spin current to zero and can even reverse its sign. The characterization of the energy dispersion of the tunnel spin polarization provides a tool for the engineering of the spin-dependent thermoelectric properties of ferromagnetic tunnel contacts.
机译：已经从热和电流自旋电流中提取了铁磁隧道触点（Co_（70）Fe_（30）/ MgO）与半导体（硅和锗）的隧道自旋极化的能量色散。结果表明，使用相同的隧道自旋极化能量色散可以同时描述热和电流自旋电流随偏置电压的变化，由此，电自旋电流由隧道自旋极化的值确定，而能量导数极化角决定了热自旋电流。对于不同器件，自旋电流的行为变化可以与隧道自旋极化的能量分散程度相关。还表明，施加适度的电压可以将热自旋电流切换为零，甚至可以反转其符号。隧道自旋极化的能量色散的表征为工程设计铁磁隧道接触的自旋相关热电性质提供了一种工具。

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