Magnetic Vortex Domain Wall Observation on Polycrystalline Imperfect Iron−Cobalt Alloy Nanowires Growing on 1050 Aluminum

César Leandro Londoño-Calderón, Alejandra Londoño-Calderón, Oscar Moscoso-Londoño, Arturo Galindo, Arturo Ponce, Laura Gabriela Pampillo, Ricardo Martínez-García, Miguel José Yacamán, Marcelo Knobel

Research output: Contribution to journalArticlepeer-review

Abstract

Herein, the magnetic vortex domain wall structure of polycrystalline imperfect iron−cobalt alloy nanowires (Nws) growing on 1050 aluminum by pulsed electrodeposition is reported. The magnetic properties are analyzed using magnetometry and off-axis electron holography. The electrodeposited Nw arrays show homogeneous elemental composition and exhibit a structure composed of piled-up grains of small crystallites. The saturation magnetization, coercive field, and reduced remanence, measured in directions parallel and perpendicular to the Nw's axis, are studied as a function of the temperature. Although the array of Nws on anodized aluminum grows both straight and within an inclination angle, in both cases, a high shape anisotropy is noticed, which is the most predominant contribution to the magnetic behavior. Misalignments and defects of the Nws in the array, as well as the wide distribution of lengths and diameters, do not contribute significantly to coercivity dispersion. A modified model is used to explain the changes in the magnetic behavior of the Nw's arrays, which accounts for structural imperfections and magnetostatic interactions. The reversal magnetization arising from the vortex domain wall propagation via localized curling is verified by off-axis electron holography.

Original languageEnglish (US)
Article number2100265
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume219
Issue number5
DOIs
StatePublished - Mar 2022

Keywords

  • FeCo
  • electron holography
  • low-purity aluminum
  • magnetic properties
  • nanowire arrays

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

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