Meier Guido, Bolte Markus, Eiselt René, Krüger Benjamin, Kim Dong-Hyun, Fischer Peter
Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany.
Phys Rev Lett. 2007 May 4;98(18):187202. doi: 10.1103/PhysRevLett.98.187202. Epub 2007 May 2.
Magnetic transmission x-ray microscopy is used to directly visualize the influence of a spin-polarized current on domain walls in curved permalloy wires. Pulses of nanosecond duration and of high current density up to 1.0x10(12) A/m(2) are used to move and to deform the domain wall. The current pulse drives the wall either undisturbed, i.e., as composite particle through the wire, or causes structural changes of the magnetization. Repetitive pulse measurements reveal the stochastic nature of current-induced domain-wall motion.
磁传输X射线显微镜用于直接观察自旋极化电流对弯曲坡莫合金丝中畴壁的影响。使用持续时间为纳秒级、电流密度高达1.0×10¹² A/m²的脉冲来移动和使畴壁变形。电流脉冲要么不受干扰地驱动畴壁，即作为复合粒子穿过导线，要么引起磁化的结构变化。重复脉冲测量揭示了电流诱导畴壁运动的随机性。
