Effective anisotropies in magnetic nanowires using the torque method

C. Rotarescu, R. Moreno, J. A. Fernández-Roldan, D. G. Trabada, N. M. Nemes, T. Fehér, C. Bran, M. Vázquez, H. Chiriac, N. Lupu, T. A. Óvári, O. Chubykalo-Fesenko

Research output: Article

1 Citation (Scopus)

Abstract

The effective anisotropy of Co-based nanowires such as CoFe, monocrystalline hcp Co and polycrystalline Co with a mixture of fcc and hcp grains has been evaluated through micromagnetic modeling based on the magnetization torque simulations. We retrieve the experimental profile of the torque curves and show that the non-harmonic forms observed at low fields correspond to the presence of open vortices at the nanowire ends. Our results show that strong hcp anisotropy of Co cannot overcome the uniaxial character of the effective anisotropy which always remains parallel to the nanowire axis, even in the case of magnetocrystalline easy axis perpendicular to the nanowire. We evaluate effective anisotropy values for monocrystalline Co nanowires with different easy axis orientations and polycrystalline Co nanowires with different mixtures of hcp and fcc grains.

Original languageEnglish
Pages (from-to)378-384
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume443
DOIs
Publication statusPublished - dec. 1 2017

Fingerprint

Nanowires
torque
Anisotropy
nanowires
Torque
anisotropy
Magnetization
Vortex flow
vortices
magnetization
curves
profiles
simulation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Rotarescu, C., Moreno, R., Fernández-Roldan, J. A., Trabada, D. G., Nemes, N. M., Fehér, T., ... Chubykalo-Fesenko, O. (2017). Effective anisotropies in magnetic nanowires using the torque method. Journal of Magnetism and Magnetic Materials, 443, 378-384. https://doi.org/10.1016/j.jmmm.2017.07.059

Effective anisotropies in magnetic nanowires using the torque method. / Rotarescu, C.; Moreno, R.; Fernández-Roldan, J. A.; Trabada, D. G.; Nemes, N. M.; Fehér, T.; Bran, C.; Vázquez, M.; Chiriac, H.; Lupu, N.; Óvári, T. A.; Chubykalo-Fesenko, O.

In: Journal of Magnetism and Magnetic Materials, Vol. 443, 01.12.2017, p. 378-384.

Research output: Article

Rotarescu, C, Moreno, R, Fernández-Roldan, JA, Trabada, DG, Nemes, NM, Fehér, T, Bran, C, Vázquez, M, Chiriac, H, Lupu, N, Óvári, TA & Chubykalo-Fesenko, O 2017, 'Effective anisotropies in magnetic nanowires using the torque method', Journal of Magnetism and Magnetic Materials, vol. 443, pp. 378-384. https://doi.org/10.1016/j.jmmm.2017.07.059
Rotarescu, C. ; Moreno, R. ; Fernández-Roldan, J. A. ; Trabada, D. G. ; Nemes, N. M. ; Fehér, T. ; Bran, C. ; Vázquez, M. ; Chiriac, H. ; Lupu, N. ; Óvári, T. A. ; Chubykalo-Fesenko, O. / Effective anisotropies in magnetic nanowires using the torque method. In: Journal of Magnetism and Magnetic Materials. 2017 ; Vol. 443. pp. 378-384.
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AU - Moreno, R.

AU - Fernández-Roldan, J. A.

AU - Trabada, D. G.

AU - Nemes, N. M.

AU - Fehér, T.

AU - Bran, C.

AU - Vázquez, M.

AU - Chiriac, H.

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AU - Óvári, T. A.

AU - Chubykalo-Fesenko, O.

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AB - The effective anisotropy of Co-based nanowires such as CoFe, monocrystalline hcp Co and polycrystalline Co with a mixture of fcc and hcp grains has been evaluated through micromagnetic modeling based on the magnetization torque simulations. We retrieve the experimental profile of the torque curves and show that the non-harmonic forms observed at low fields correspond to the presence of open vortices at the nanowire ends. Our results show that strong hcp anisotropy of Co cannot overcome the uniaxial character of the effective anisotropy which always remains parallel to the nanowire axis, even in the case of magnetocrystalline easy axis perpendicular to the nanowire. We evaluate effective anisotropy values for monocrystalline Co nanowires with different easy axis orientations and polycrystalline Co nanowires with different mixtures of hcp and fcc grains.

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KW - Micromagnetic simulations

KW - Nanowires

KW - Torque method

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