Title

Antivortex Dynamics in Magnetic Nanostripes

Document Type

Article

Language

eng

Publication Date

2009

Publisher

American Institute of Physics

Source Publication

Journal of Applied Physics

Source ISSN

0021-8979

Abstract

In a thin magnetic nanostripe, an antivortex nucleates inside a moving domain wall when driven by an in-plane magnetic field greater than the so-called Walker field. The nucleated antivortex must cross the width of the nanostripe before the domain wall can propagate again, leading to low average domain wall speeds. A large out-of-plane magnetic field, applied perpendicularly to the plane of the nanostripe, inhibits the nucleation of the antivortex leading to fast domain wall speeds for all in-plane driving fields. We present micromagnetic simulation results relating the antivortex dynamics to the strength of the out-of-plane field. An asymmetry in the motion is observed which depends on the alignment of the antivortex core magnetic moments to the direction of the out-of-plane field. The size of the core is directly related to its crossing speed, both depending on the strength of the perpendicular field and the alignment of the core moments and direction of the out-of-plane field.

Comments

Published version. Journal of Applied Physics, Vol. 105, No. 7 (2009). DOI. © American Institute of Physics 2009. Used with permission.