Kimura T, Otani Y, Hamrle J
Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
Phys Rev Lett. 2006 Jan 27;96(3):037201. doi: 10.1103/PhysRevLett.96.037201. Epub 2006 Jan 23.
We have performed nonlocal spin injection into a nanoscale ferromagnetic particle configured in a lateral spin-valve structure to switch its magnetization only by spin current. The nonlocal spin injection aligns the magnetization of the particle parallel to the magnetization of the spin injector. The spin current responsible for switching is estimated from the experiment to be about 200 microA, which is reasonable compared with the values obtained for conventional pillar structures. Interestingly, the switching always occurs from antiparallel to parallel in the particle-injector magnetic configurations, where no opposite switching is observed. Possible reasons for this discrepancy are discussed.
我们已将非局域自旋注入到配置为横向自旋阀结构的纳米级铁磁颗粒中，以仅通过自旋电流来切换其磁化方向。非局域自旋注入使颗粒的磁化方向与自旋注入器的磁化方向平行排列。通过实验估计，负责切换的自旋电流约为200微安，与传统柱状结构所获得的值相比，这一数值是合理的。有趣的是，在颗粒 - 注入器磁配置中，切换总是从反平行状态到平行状态发生，未观察到相反的切换情况。文中讨论了这种差异可能的原因。
