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Tailoring the magnetic properties of ordered 50-nm-diameter CoNi nanowire arrays

  • A. Pereira
  • C. Gallardo
  • A. P. Espejo
  • J. Briones
  • L. G. Vivas
  • M. Vázquez
  • J. C. Denardin
  • J. Escrig
Research Paper

Abstract

Co x Ni1−x alloy nanowires with varying Co content (0 ≤ x ≤ 1), having a diameter of 50 nm and a length of 3 μm, have been fabricated by electrodeposition using an anodized aluminum oxide template. The composition and crystalline structure of the CoNi nanowires were determined by high-resolution scanning electron microscopy and energy-dispersive spectroscopy techniques. The room temperature magnetic behavior of the CoNi nanowire arrays is also studied and correlated with their structural and morphological properties. Analytical calculations of the angular dependence of the coercivity allow us to confirm that the magnetization reversal is mostly ascribed to the propagation of a transverse domain wall. Furthermore, our results indicate that the values of the effective anisotropy not only depend on the diameter of the nanowires, but also on the composition of the alloy. Finally, accurate control of the crystalline anisotropy plays a key role in the design of nanostructures with a required magnetic behavior, suitable for applications.

Keywords

CoNi nanowire arrays Magnetic anisotropy Angular dependence Transverse reversal mode Nanostructure 

Notes

Acknowledgments

A.P. is grateful to the Institute of Materials Science of Madrid-CSIC for its hospitality. We thank Paul E. D. Soto Rodriguez for SEM images and useful discussions. In Chile, we acknowledge support from FONDECYT under projects 1110784, 1110252 and 3120059; Grant ICM P10-061-F by Fondo de Innovación para la Competitividad-MINECON, AFOSR FA9550-11-1-0347; and Financiamiento Basal para Centros Científicos y Tecnológicos de Excelencia under project FB0807. MECESUP2 USA0707 and CONICYT PhD Program Fellowships are also acknowledged.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • A. Pereira
    • 1
  • C. Gallardo
    • 2
  • A. P. Espejo
    • 2
  • J. Briones
    • 2
    • 3
  • L. G. Vivas
    • 4
    • 5
  • M. Vázquez
    • 4
  • J. C. Denardin
    • 2
    • 3
  • J. Escrig
    • 2
    • 3
  1. 1.Departamento de MetalurgiaUniversidad de Santiago de Chile (USACH)SantiagoChile
  2. 2.Departamento de FísicaUniversidad de Santiago de Chile (USACH)SantiagoChile
  3. 3.Center for the Development of Nanoscience and Nanotechnology (CEDENNA)SantiagoChile
  4. 4.Institute of Materials Science of MadridCSICMadridSpain
  5. 5.Grupo de Física de la Materia Condensada, Departamento de FísicaUniversidad de los AndesBogotáColombia

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