Fachbereich Physik, Universität Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany.
Phys Rev Lett. 2010 Aug 13;105(7):076601. doi: 10.1103/PhysRevLett.105.076601. Epub 2010 Aug 12.
We study the depinning of domain walls by pure diffusive spin currents in a nonlocal spin valve structure based on two ferromagnetic Permalloy elements with copper as the nonmagnetic spin conduit. The injected spin current is absorbed by the second Permalloy structure with a domain wall, and from the dependence of the wall depinning field on the spin current density we find an efficiency of 6×10{-14} T/(A/m{2}), which is more than an order of magnitude larger than for conventional current induced domain-wall motion. Theoretically we find that this high efficiency arises from the surface torques exerted by the absorbed spin current that lead to efficient depinning.
我们研究了在基于两个铁磁坡莫合金元件的非局域自旋阀结构中，通过纯扩散自旋流使畴壁退钉扎的现象，其中铜作为非磁性自旋导管。注入的自旋流被第二个具有畴壁的坡莫合金结构吸收，从壁退钉扎场对自旋电流密度的依赖关系中，我们发现效率为 6×10{-14} T/(A/m{2})，比传统的电流诱导壁运动的效率高一个数量级以上。从理论上我们发现，这种高效率是由于吸收的自旋流产生的表面力矩导致的有效退钉扎。
