title: Domain wall trapping and influence of the asymmetry in magnetic nanoring studied by micromagnetic simulations.
abstract: We have studied the magnetic switching behavior of permalloy asymmetric rings using micromagnetic simulations. The simulation results have revealed that a domain wall trapping feature is present at the narrow arm of the asymmetric ring. This trapping feature is obtained via precise control of the lateral geometric features, the ring asymmetry and the film thickness. Our results show that the trapped domain walls do not annihilate until the magnetization in the wide arm is reversed under a relatively large magnetic field. Furthermore, the magnetic field strength needed to annihilate the domain wall is found to be decreasing with larger asymmetry ratio.
authors: Physics and Applied Physics Division, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371.
authors: X H
authors: XH
authors: Wang
authors: W Z
authors: WZ
authors: Wang
authors: T F
authors: TF
authors: Kong
authors: W S
authors: WS
authors: Lew
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004574:Electromagnetic Fields; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008280:Magnetics / Q000295:instrumentation*; D008962:Models, Theoretical; D036103:Nanotechnology / Q000295:instrumentation*