Magnetization reversal assisted by half antivortex states in nanostructured circular cobalt disks

Lara, Antonio and Dobrovolskiy, O. V. and Prieto Martin, Jose Luis and Huth, Michael and Aliev, Farkhad G. (2014). Magnetization reversal assisted by half antivortex states in nanostructured circular cobalt disks. "Applied Physics Letters", v. 105 (n. 18); pp.. ISSN 0003-6951. https://doi.org/10.1063/1.4900789.

Description

Title: Magnetization reversal assisted by half antivortex states in nanostructured circular cobalt disks
Author/s:
  • Lara, Antonio
  • Dobrovolskiy, O. V.
  • Prieto Martin, Jose Luis
  • Huth, Michael
  • Aliev, Farkhad G.
Item Type: Article
Título de Revista/Publicación: Applied Physics Letters
Date: 2014
ISSN: 0003-6951
Volume: 105
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The half antivortex, a fundamental topological structure which determines magnetization reversal of submicron magnetic devices with domain walls, has been suggested also to play a crucial role in spin torque induced vortex core reversal in circular disks. Here, we report on magnetization reversal in circular disks with nanoholes through consecutive metastable states with half antivortices. In-plane anisotropic magnetoresistance and broadband susceptibility measurements accompanied by micromagnetic simulations reveal that cobalt (Co) disks with two and three linearly arranged nanoholes directed at 45° and 135° with respect to the external magnetic field show reproducible step-like changes in the anisotropic magnetoresistance and magnetic permeability due to transitions between different intermediate states mediated by vortices and half antivortices confined to the dot nanoholes and edges, respectively. Our findings are relevant for the development of multi-hole based spintronic and magnetic memory devices.

More information

Item ID: 35883
DC Identifier: http://oa.upm.es/35883/
OAI Identifier: oai:oa.upm.es:35883
DOI: 10.1063/1.4900789
Official URL: http://scitation.aip.org/content/aip/journal/apl/105/18/10.1063/1.4900789
Deposited by: Memoria Investigacion
Deposited on: 27 Jun 2015 11:38
Last Modified: 27 Jun 2015 11:38
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