Crystallographically driven magnetic behaviour of arrays of monocrystalline Co nanowires

Yurii P. Ivanov, Daniel G. Trabada, Andrey L. Chuvilin, Jürgen Kosel, Oksana A. Chubykalo-Fesenko, Manuel M. Vázquez.

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Cobalt nanowires, 40 nm in diameter and several micrometers long, have been grown by controlled electrodeposition into ordered anodic alumina templates. The hcp crystal symmetry is tuned by a suitable choice of the electrolyte pH (between 3.5 and 6.0) during growth. Systematic high resolution transmission electron microscopy imaging and analysis of the electron diffraction patterns reveals a dependence of crystal orientation from electrolyte pH. The tailored modification of the crystalline signature results in the reorientation of the magnetocrystalline anisotropy and increasing experimental coercivity and squareness with decreasing polar angle of the 'c' growth axis. Micromagnetic modeling of the demagnetization process and its angular dependence is in agreement with the experiment and allows us to establish the change in the character of the magnetization reversal: from quasi-curling to vortex domain wall propagation modes when the crystal 'c' axis tilts more than 75° in respect to the nanowire axis.
Original languageEnglish (US)
Pages (from-to)475702
JournalNanotechnology
Volume25
Issue number47
DOIs
StatePublished - Nov 7 2014

ASJC Scopus subject areas

  • Bioengineering
  • Mechanics of Materials
  • Materials Science(all)
  • Chemistry(all)
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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