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Oersted field assisted magnetization reversal in cylindrical core-shell nanostructures

Oersted field assisted magnetization reversal in cylindrical core-shell nanostructures
Oersted field assisted magnetization reversal in cylindrical core-shell nanostructures

A method to manipulate magnetization reversal in core-shell nanostructures is presented. The focus is on cylindrical multilayer structures comprising of an inner conductor wire covered by two shells: (i) an intermediate non-conducting and non-magnetic shell and (ii) a nanotube made of an outer ferromagnetic layer. The properties of the magnetization reversal of the ferromagnetic phase are investigated when a circular Oersted field is generated by applying an electric current through the inner wire. Coercive fields and remanent magnetization as functions of the circular field strength are explored. By means of a simple analytical model and OOMMF simulations, once the current is turned on, two key results have been found: (i) A manipulable axial demagnetization, that is, a magnetization transition from the quasi uniform alignment to a flux closure circular configuration when the circular field strength is above a critical field; and (ii) a quadratic reduction of the coercivity on the circular field strength, in the case that the nanotube magnetization is switched by an applied magnetic field along the tube axis and further assisted by a circular Oersted field. It is found that in this kind of structures, Oersted field assisted magnetization reversal (OAMR) can be an alternative way to reduce coercivity, as required by the magnetic storage industry and currently performed with heat assisted techniques.

0021-8979
Otálora, J. A.
b29d6af9-f696-4f21-a9af-5b955be7b2f8
Cortés-Ortuño, D.
97d026d6-1083-4edf-8ba6-2f66a3e15033
Görlitz, D.
dd986b97-6aa2-427b-ab68-f67c78ef98d2
Nielsch, K.
8d715baf-0833-4ca3-8f7f-d75cd2c83bbd
Landeros, P.
ade05e37-18cf-4752-b729-0d32f9244ca1
Otálora, J. A.
b29d6af9-f696-4f21-a9af-5b955be7b2f8
Cortés-Ortuño, D.
97d026d6-1083-4edf-8ba6-2f66a3e15033
Görlitz, D.
dd986b97-6aa2-427b-ab68-f67c78ef98d2
Nielsch, K.
8d715baf-0833-4ca3-8f7f-d75cd2c83bbd
Landeros, P.
ade05e37-18cf-4752-b729-0d32f9244ca1

Otálora, J. A., Cortés-Ortuño, D., Görlitz, D., Nielsch, K. and Landeros, P. (2015) Oersted field assisted magnetization reversal in cylindrical core-shell nanostructures. Journal of Applied Physics, 117 (17), [173914]. (doi:10.1063/1.4919746).

Record type: Article

Abstract

A method to manipulate magnetization reversal in core-shell nanostructures is presented. The focus is on cylindrical multilayer structures comprising of an inner conductor wire covered by two shells: (i) an intermediate non-conducting and non-magnetic shell and (ii) a nanotube made of an outer ferromagnetic layer. The properties of the magnetization reversal of the ferromagnetic phase are investigated when a circular Oersted field is generated by applying an electric current through the inner wire. Coercive fields and remanent magnetization as functions of the circular field strength are explored. By means of a simple analytical model and OOMMF simulations, once the current is turned on, two key results have been found: (i) A manipulable axial demagnetization, that is, a magnetization transition from the quasi uniform alignment to a flux closure circular configuration when the circular field strength is above a critical field; and (ii) a quadratic reduction of the coercivity on the circular field strength, in the case that the nanotube magnetization is switched by an applied magnetic field along the tube axis and further assisted by a circular Oersted field. It is found that in this kind of structures, Oersted field assisted magnetization reversal (OAMR) can be an alternative way to reduce coercivity, as required by the magnetic storage industry and currently performed with heat assisted techniques.

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More information

Published date: 7 May 2015

Identifiers

Local EPrints ID: 428256
URI: http://eprints.soton.ac.uk/id/eprint/428256
ISSN: 0021-8979
PURE UUID: 782c509b-30c4-4b93-b230-780586f8f08d
ORCID for D. Cortés-Ortuño: ORCID iD orcid.org/0000-0003-3799-3141

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Date deposited: 19 Feb 2019 17:30
Last modified: 05 Jun 2024 19:53

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Contributors

Author: J. A. Otálora
Author: D. Cortés-Ortuño ORCID iD
Author: D. Görlitz
Author: K. Nielsch
Author: P. Landeros

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