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Nanoscale magnetic heat pumps and engines

机译:纳米级磁性热泵和发动机

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摘要

We present the linear-response matrix for a sliding domain wall in a rotatable magnetic nanowire, which is driven out of equilibrium by temperature and voltage bias, mechanical torque, and magnetic field. An expression for heat-current-induced domain-wall motion is derived. Application of Onsager's reciprocity relation leads to a unified description of the Barnett and Einstein-de Haas effects as well as spin-dependent thermoelectric properties. We envisage various heat pumps and engines, such as coolers driven by magnetic fields or mechanical rotation as well as nanoscale motors that convert temperature gradients into useful work. All parameters (with the exception of mechanical friction) can be computed microscopically by the scattering theory of transport.
机译:我们提出了可旋转磁性纳米线中滑动畴壁的线性响应矩阵,该矩阵被温度和电压偏置,机械转矩和磁场驱动而失去平衡。导出了热电流引起的畴壁运动的表达式。 Onsager互惠关系的应用导致对Barnett和Einstein-de Haas效应以及与自旋有关的热电性质的统一描述。我们设想了各种热泵和发动机,例如由磁场或机械旋转驱动的冷却器,以及将温度梯度转换为有用功的纳米级电动机。所有参数(机械摩擦除外)都可以通过传输散射理论进行微观计算。

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