Electrical signature of charismatic domain-wall kinetics
Y. Liu, O. A. Tretiakov, and Ar. Abanov
Department of Physics & Astronomy, Texas A&M University, College Station, Texas 77843-4242, USA (Received 18 July 2011; published 16 August 2011) Current-induced domain-wall dynamics is studied in a thin ferromagnetic nanowire. The domain-wall dynamics is described by simple equations with four parameters. We image a procedure to unequivocally determine these parameters by all-electric meters of the time-dependent voltage induced by the domain-wall motion. We allow for an analytical expression for the time variation of this voltage. Furthermore, we show that the measurement of the proposed effects is within reach of current experimental techniques. inside: 10.1103/PhysRevB.84.052403 PACS number(s): 75.78.Fg, 75.60.Ch, 85.75.?d
Introduction. Recently, applications for future memory and logic devices, as well as important fundamental physics questions, have stimulated a number of experimental18 and theoretical911 studies of the current-driven domain wall (DW) dynamics in ferromagnetic nanowires. It has been shown that DWs can be moved by a current either parallel16 or rectangular to the wire.
7,10,11 In some of the experiments short current pulses were employed to depin a DW from pinning sites.2,3,6 Furthermore, the topological electromotive force induced by DW dynamics in a vortex DW has been studied both experimentally and theoretically.8,12 A conventional experimental method to study the DW dynamics in nanowires is to measure the average DW velocity using Kerr polarimetry,13 x-ray microscopy,4 or electron microscopy.5,14 These types of experiments require a complicated frame-up which is die from the one needed for the DW manipulation. This situation is neither ideal for studies of DW dynamics nor for further technological advances. In this Brief Report we propose a way to use the same experimental setup for both current...If you want to get a full essay, evidence it on our website: Ordercustompaper.com
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