Energy dispersion of tunnel spin polarization extracted from thermal and electrical spin currents
Energy dispersion of tunnel spin polarization extracted from thermal and electrical spin currents
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从热自旋电流和电自旋电流中提取的隧道自旋极化的能量色散
DOI：
10.1103/physrevb.91.155305
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and Ron Jansen
中科院分区：
文献类型：
--
作者：
Kun-Rok Jeon;Hidekazu Saito;Shinji Yuasa;and Ron Jansen
铁磁隧道接触半导体（硅和锗）的隧道自旋极化的能量色散已被提取的热和电自旋电流。它表明，热和电的自旋电流与偏置电压的变化可以同时使用相同的能量色散的隧道自旋极化，从而电的自旋电流是由隧道自旋极化的值，而极化的能量导数确定的热自旋电流。不同器件的自旋电流行为的变化可以与隧道自旋极化的能量色散程度相关。它还表明，一个适度的电压的应用程序可以切换到零的热自旋电流，甚至可以反转其符号。隧道自旋极化的能量色散的表征提供了一个工具的自旋相关的铁磁隧道接触的热电性能的工程。
The energy dispersion of the tunnel spin polarization of ferromagnetic tunnel contactsto 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.