Skip to main content
SpringerLink
Log in

Thermally activated transformation of magnetization-reversal modes in ultrathin nanoparticles

  • Condensed Matter
  • Published:
Journal of Experimental and Theoretical Physics Letters Aims and scope Submit manuscript

Abstract

The influence of thermal fluctuations on magnetization-reversal processes in ultrathin magnetic particles is investigated on the basis of a numerical solution of the Landau-Lifshitz-Gilbert equations taking account the thermal-activation fluctuation field. It is shown that for nanoparticles there exists a region of magnetic and geometric parameters where a strong jump-like instability of the critical field for magnetization reversal arises. This instability is due to the thermally activated transformation of magnetization configurations far from the switching threshold. The thermal-instability mechanism described is important for particles of much larger sizes than for the single-mode Néel-Brown instability.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. H. N. Bertram and J. G. Zhu, Solid State Phys. 46, 271 (1992).

    Google Scholar 

  2. L. Néel, Ann. Geophys. 5, 99 (1949); W. F. Brown, Phys. Rev. 130, 1677 (1963).

    Google Scholar 

  3. P.-L. Lu and S. H. Charap, IEEE Trans. Magn. 31, 2767 (1995).

    Google Scholar 

  4. S. Charap, P. Lu, and Y. He, IEEE Trans. Magn. 33, 978 (1997).

    Article  Google Scholar 

  5. Y. Zheng and J.-G. Zhu, J. Appl. Phys. 81, 5471 (1997).

    ADS  Google Scholar 

  6. E. D. Boerner and H. N. Bertram, IEEE Trans. Magn. 33, 3052 (1997).

    Article  Google Scholar 

  7. Y. Nakatani, Y. Uesaka, and N. Haiashi, Jpn. J. Appl. Phys., Part 1 28, 2485 (1989).

    Google Scholar 

  8. S. G. Osipov and M. M. Khapaev, Zh. Éksp. Teor. Fiz. 90, 1354 (1990) [Sov. Phys. JETP 71, 756 (1990)].

    Google Scholar 

  9. N. A. Usov and S. E. Peschany, JMMM 130, 275 (1994).

    ADS  Google Scholar 

  10. S. G. Filippov and L. G. Korzunin, Fiz. Tverd. Tela (St. Petersburg) 38, 2442 (1996) [Phys. Solid State 38, 1343 (1990)].

    Google Scholar 

  11. L. D. Landau and E. M. Lifshitz, Statistical Physics (Pergamon Press, New York) [Russian original, Nauka, Moscow, 1964].

Download references

Author information

Authors and Affiliations

  1. F. V. Lukin State Scientific-Research Institute of Physical Problems, 103460, Moscow, Russia

    A. F. Popkov

  2. M. V. Lomonosov Moscow State University, 119899, Moscow, Russia

    L. L. Savchenko

  3. Physicotechnical Institute, Russian Academy of Sciences, 117218, Moscow, Russia

    N. V. Vorotnikova

Authors
  1. A. F. Popkov
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. L. L. Savchenko
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. N. V. Vorotnikova
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

Pis’ma Zh. Éksp. Teor. Fiz. 69, No. 8, 555–560 (25 April 1999)

Rights and permissions

Reprints and permissions

About this article

Cite this article

Popkov, A.F., Savchenko, L.L. & Vorotnikova, N.V. Thermally activated transformation of magnetization-reversal modes in ultrathin nanoparticles. Jetp Lett. 69, 596–602 (1999). https://doi.org/10.1134/1.567966

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1134/1.567966

PACS numbers

Search

Navigation