An electric pulse-controlled thermal spin injector is theoretically proposed, which consists of a junction with a single-molecule magnet sandwiched between the ferromagnetic and nonmagnetic leads. By applying a temperature gradient and a time-varying bias pulses across the junction, the spin direction of the single-molecule magnet can be controlled to be antiparallel or parallel to the magnetization of the ferromagnetic lead by a spin-transfer torque effect, and the spin polarization of thermoelectric current tunneling through this junction can be switched from $+100\text{\%}$ to $-100\text{\%}$ corresponding to a molecule’s spin orientation, respectively. Our numerical results show that the spin polarization of the thermoelectric current will not be easily affected by the magnetization of electrodes, which can be fully and precisely tuned in electric manner. This device scheme can be compatible with current technologies and has potential applications in future spin caloritronics devices.

理论上提出了一种电脉冲控制的热自旋注入器，它由夹在铁磁性和非磁性引线之间的单分子磁铁的结组成。通过在结上施加温度梯度和随时间变化的偏置脉冲，可以通过自旋转移扭矩效应控制单分子磁体的自旋方向与铁磁引线的磁化反平行或平行，并且通过该结的热电流隧道的自旋极化可以从$+100\text{\%}$ 到 $-100\text{\%}$分别对应于分子的自旋方向。我们的数值结果表明，热电流的自旋极化不容易受到电极磁化的影响，电极的磁化可以通过电方式进行充分而精确的调谐。该器件方案可与当前技术兼容，在未来的自旋热电子器件中具有潜在应用。