High-field domain wall propagation velocity in magnetic nanowiresX. R. Wang, P. Yan and J. Lu
Physics Department, The Hong Kong University of Science and Technology - Clear Water Bay, Hong Kong SAR, China
received 8 March 2009; accepted in final form 29 May 2009; published June 2009
published online 26 June 2009
A theory of field-induced domain wall (DW) propagation is developed. The theory not only explains why a DW in a defect-free nanowire must propagate at a finite velocity, but also provides a proper definition of DW propagation velocity. This definition, valid for an arbitrary DW structure, allows one to compute the instantaneous DW velocity in a meaningful way even when the DW is not moving as a rigid body. A new velocity-field formula beyond the Walker breakdown field, which is in excellent agreement with both experiments and numerical simulations, is derived.
75.60.Jk - Magnetization reversal mechanisms.
75.75.+a - Magnetic properties of nanostructures.
85.70.Ay - Magnetic device characterization, design, and modeling.
© EPLA 2009