Development of the rectifying device for spin dynamics using asymmetric potential

我们开展的研究项目涉及以下3个主题：1。磁性椭圆环中成对畴壁的棘轮动力学。我们建立了椭圆环结构中诱导配对磁畴壁旋转运动的闪烁棘轮和基于环下2度交叉弯曲阻力测量的局部磁强计。因此，我们试图检测自旋动力作为应用的一个例子。然而，自旋动势产生的感应电流的大小太小，无法用本研究建立的技术进行实验检测。这项探测工作仍是今后的任务。可开关磁门控制磁畴壁钉钉。我们已经通过实验和数值证明了一种可切换磁门，通过将成对磁线的磁排列从平行改变为反平行，可以静磁激活畴壁钉。这种磁门可以作为域壁棘轮和逻辑器件的组成部分。自旋整流装置。我们利用自旋霍尔效应证明了从非极化到极化自旋电流的自旋整流。通过对应用于横向自旋阀结构的自旋吸收技术进行优化，我们成功地在室温下观察到铂纳米线中的自旋霍尔效应，该效应比半导体中的自旋霍尔效应大1000倍。

We have performed research projects related to 3 topics below :1. Ratchet dynamics of paired domain walls in a magnetic elliptic ring.We have established the flashing ratchet which induces the rotary motion of paired magnetic domain walls in an elliptic ring structure and the local magnetometry based on the bend resistance measurement of 2 DEG cross beneath the ring. Thereby we tried to detect the spin motive force as an example of application. However the magnitude of the induced current by the spin motive force was too small to experimentally detect by using the technique established in the present study. The detection remained as a future task.2. Control of domain wall pinning by a switchable magnetic gate.We have demonstrated experimentally and numerically a switchable magnetic gate whereby the domain wall pinning can be magnetostatically activated by altering the magnetic alignment of paired magnetic wires from parallel to antiparallel. This magnetic gate could be a building block of the domain wall ratchet and logic devices.3. Spin rectifying device.We have demonstrated that spin rectification from unpolarized to polarized spin currents by using the spin Hall Effects. After optimizing the spin absorption technique applied to the lateral spin valve structure, we succeeded in observing at room temperature the spin Hall Effect in a platinum nano-wire which is 1000 times larger than the effect observed in semiconductors.