Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session H33: Focus Session: Magnetization and Spin Dynamics II
8:00 AM–11:00 AM,
Tuesday, March 16, 2010
Sponsoring Units: GMAG DMP
Chair: A. Lukaszew, College of William and Mary
Abstract ID: BAPS.2010.MAR.H33.4
Abstract: H33.00004 : Field-driven domain wall propagation in magnetic nanowires*
8:36 AM–9:12 AM
Preview Abstract Abstract
(The Hong Kong University of Science and Technology)
In this talk, I will present a global picture of magnetic-field induced domain wall (DW) propagation along a magnetic nanowire [1,2]: A static DW cannot exist in a homogeneous magnetic nanowire when an external magnetic field is applied. Thus, a DW must vary with time under a static magnetic field. A moving DW must dissipate energy due to the Gilbert damping. As a result, the wire has to release its Zeeman energy through the DW propagation along the field direction. The DW propagation speed is proportional to the energy dissipation rate that is determined by the DW structure. An oscillatory DW motion, either the precession around the wire axis or the breath of DW width, should lead to the speed oscillation. Based on this view, a relationship between the domain wall propagation velocity and the domain wall profile, regardless of the DW types, is found. A new velocity-field formula beyond the Walker breakdown field is derived. The formula is in excellent agreement with both experiments and numerical simulations. \\[4pt]  ``Magnetic field driven domain wall propagation in magnetic nanowires,'' X.R. Wang, P. Yan, J. Lu, and C. He, Annals of Physics 324, 1815 (2009).\\[0pt] ``High field domain wall propagation velocity in magnetic nanowires,'' X.R. Wang, P. Yan and J. Lu, Europhysiccs Letters 86, 67001 (2009).
*This work is supported by Hong Kong UGC/CERG grants (\#603007, 603508,604109 and HKUST17/CRF/08).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.H33.4
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