Spin pumping is a widely recognized method to generate the spin current in the spintronics, which is acknowledged as a fundamentally dynamic process equivalent to the spin-transfer torque. In this work, we theoretically verify that the oscillating spin current can be pumped from the microwave-motivated breathing skyrmion. The skyrmion spin pumping can be excited by a relatively low frequency compared with the ferromagnetic resonance (FMR) and the current density is larger than the ordinary FMR spin pumping. Based on the skyrmion spin pumping, we build a high reading-speed racetrack memory model whose reading speed is an order of magnitude higher than the SOT (spin-orbit torque) /STT (spin-transfer torque) skyrmion racetrack. Our work explored the spin pumping phenomenon in the skyrmion, and it may contribute to the applications of the skyrmion-based device.

中文翻译：

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由受限呼吸 Skyrmion 泵送的自旋电流

自旋泵浦是在自旋电子学中产生自旋电流的一种广泛认可的方法，它被认为是一个基本的动态过程，相当于自旋转移矩。在这项工作中，我们从理论上验证了振荡自旋流可以从微波驱动的呼吸斯格明子泵浦。与铁磁共振 (FMR) 相比，斯格明子自旋泵浦可以被相对较低的频率激发，并且电流密度比普通 FMR 自旋泵浦更大。基于skyrmion自旋泵浦，我们构建了一个高读取速度的赛道记忆模型，其读取速度比SOT（自旋轨道扭矩）/STT（自旋转移扭矩）skyrmion赛道高一个数量级。我们的工作探索了斯格明子中的自旋泵浦现象，