Development of the rectifying device for spin dynamics using asymmetric potential

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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.