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Journal of Applied Physics / Volume 111 / Issue 7 / PROCEEDINGS OF THE 56TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Soft Magnetic Materials

J. Appl. Phys. 111, 07A325 (2012); http://dx.doi.org/10.1063/1.3676431 (3 pages)

Temperature dependent magnetization in Co-base nanowire arrays: Role of crystalline anisotropy

L. G. Vivas1, M. Vázquez1, V. Vega2, J. García2, W. O. Rosa2, R. P. del Real1, and V. M. Prida2

1Institute of Materials Science of Madrid, CSIC, 28049 Madrid, Spain
2Depto. Física, Universidad de Oviedo, 33007-Oviedo, Spain

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(Received 20 September 2011; accepted 11 November 2011; published online 16 February 2012)

Co, Co(1−x)Pdx, and Co(1−y)Niy nanowire arrays have been prepared by electrochemical template-assisted growth. Hcp, fcc or both phases are detected in Co nanowires depending on their length (300 nm to 40 μm) and on the content of Pd (0 ≤ x ≤ 0.4) and Ni (0 ≤ y ≤ 0.8). Their magnetic behavior has been studied under longitudinal and perpendicular applied fields. The effective magnetic anisotropy is mostly determined by the balance between the shape and the crystalline terms, the latter depending on the fractional volume of hcp phase with strong perpendicular anisotropy and fcc phase with weaker longitudinal anisotropy. The temperature dependence of remanence and coercivity and the eventual observation of compensation temperature is interpreted as due to the different temperature dependence of shape and hcp crystalline anisotropy. Optimum longitudinal magnetic anisotropy is achieved in low Pd-content CoPd nanowires and in short Co nanowires.

© 2012 American Institute of Physics

KEYWORDS, PACS, and IPC

Keywords

cobalt, cobalt alloys, coercive force, compensation, nanowires, nickel alloys, palladium alloys, perpendicular magnetic anisotropy, remanence

PACS

  • 75.75.-c

    Magnetic properties of nanostructures

  • 75.78.-n

    Magnetization dynamics

  • 75.30.Gw

    Magnetic anisotropy

  • 75.50.Vv

    High coercivity materials

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

International Patent Classification (IPC)

  • B82B1/00

    Nano-structures

  • C22C19/00

    Alloys based on nickel or cobalt

  • H01F1/00

    Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3676431

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    K. R. Pirota, F. Beron, D. Zanchet, T. C. R. Rocha, D. Navas, J. Torrejon, M. Vazquez, and M. Knobel, J. Appl. Phys. 109, 083919 (2011)JAPIAU000109000008083919000001.

    L. Vila, M. Darques, A. Encinas, U. Ebels, J.-M. George, G. Faini, A. Thiaville, and L. Piraux, Phys. Rev. B 79, 172410 (2009).

    X. H. Huang, G. H. Li, X. C. Dou, and L. Li, J. Appl. Phys. 105, 084306 (2009)JAPIAU000105000008084306000001.

    L. G. Vivas, R. Yanes, O. Chubykalo-Fesenko, and M. Vazquez, Appl. Phys. Lett. 98, 232507 (2011)APPLAB000098000023232507000001.

    J. Sánchez-Barriga, M. Lucas, F. Radu, E. Martin, M. Multigner, P. Marin, A. Hernando, and G. Rivero, Phys. Rev. B 80, 184424 (2009).

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    K. R. Pirota, E. L. Silva, D. Zanchet, D. Navas, M. Vázquez, M. Hernández-Vélez, and M. Knobel, Phys. Rev. B, 76, 233410 (2007).


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