Crossover between two different magnetization reversal modes in arrays of iron oxide nanotubes

J. Escrig, J. Bachmann, J. Jing, M. Daub, D. Altbir, and K. Nielsch
Phys. Rev. B 77, 214421 – Published 16 June 2008

Abstract

The magnetization reversal in ordered arrays of iron oxide nanotubes of 50 nm outer diameter grown by atomic layer deposition is investigated theoretically as a function of the tube wall thickness dw. In thin tubes (dw<13nm) the reversal of magnetization is achieved by the propagation of a vortex domain boundary, while in thick tubes (dw>13nm) the reversal is driven by the propagation of a transverse domain boundary. Magnetostatic interactions between the tubes are responsible for a decrease in the coercive field in the array. Our calculations are in agreement with recently reported experimental results. We predict that the crossover between the vortex and transverse modes of magnetization reversal is a general phenomenon on the length scale considered.

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  • Received 20 March 2008

DOI:https://doi.org/10.1103/PhysRevB.77.214421

©2008 American Physical Society

Authors & Affiliations

J. Escrig1,2, J. Bachmann1,3, J. Jing1, M. Daub1, D. Altbir2, and K. Nielsch1,3

  • 1Max Planck Institute of Microstructure Physics, Am Weinberg 2, 06120 Halle, Germany
  • 2Departamento de Física, Universidad de Santiago de Chile (USACH), Avenida Ecuador 3493, Santiago, Chile
  • 3Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany

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Issue

Vol. 77, Iss. 21 — 1 June 2008

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