Thermally induced magnetic switching in thin ferromagnetic annuli

Kirsten Martens, D. L. Stein, A. D. Kent

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    We consider magnetization reversal due to thermal fluctuations in thin, submicron-scale rings. These mesoscopic ferromagnetic particles are of particular interest as potential information storage components in magnetoelectronic devices, because their lack of sharp ends result in a magnetization density that is significantly more stable against reversal than in thin needles and other geometries. Their two-dimensional nature and rotational symmetry allow us to incorporate long-range magnetostatic forces in a fully analytic treatment, which is not possible in most geometries. We uncover a type of 'phase transition' between different activation regimes as magnetic field is varied at fixed ring size. Previous studies of such transitions in classical activation behavior have found that they occur as length is varied, which cannot be realized easily or continuously for most systems. However, the different activation regimes in a single mesoscopic ferromagnet should be experimentally observable by changing the externally applied magnetic field, and by tuning this field the transition region itself can be studied in detail.

    Original languageEnglish (US)
    Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
    EditorsL.B. Kish, K. Lindenberg, Z. Gingl
    Pages1-11
    Number of pages11
    Volume5845
    DOIs
    StatePublished - 2005
    EventNoise in Complex Systems and Stochastic Dynamics III - Austin, TX, United States
    Duration: May 24 2005May 26 2005

    Other

    OtherNoise in Complex Systems and Stochastic Dynamics III
    CountryUnited States
    CityAustin, TX
    Period5/24/055/26/05

    Fingerprint

    magnetic switching
    annuli
    Chemical activation
    activation
    Magnetic fields
    Magnetization reversal
    magnetization
    Magnetoelectronics
    Magnetostatics
    Geometry
    rings
    magnetostatics
    geometry
    magnetic fields
    needles
    Needles
    Magnetization
    Tuning
    Phase transitions
    tuning

    Keywords

    • Kramers theory
    • Magnetic rings
    • Magnetic switching
    • Magnetization reversal
    • Micromagnetics
    • Nanomagnets
    • Néel-Brown theory
    • Stochastic escape
    • Thermal fluctuations

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Condensed Matter Physics

    Cite this

    Martens, K., Stein, D. L., & Kent, A. D. (2005). Thermally induced magnetic switching in thin ferromagnetic annuli. In L. B. Kish, K. Lindenberg, & Z. Gingl (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 5845, pp. 1-11). [03] https://doi.org/10.1117/12.610493

    Thermally induced magnetic switching in thin ferromagnetic annuli. / Martens, Kirsten; Stein, D. L.; Kent, A. D.

    Proceedings of SPIE - The International Society for Optical Engineering. ed. / L.B. Kish; K. Lindenberg; Z. Gingl. Vol. 5845 2005. p. 1-11 03.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Martens, K, Stein, DL & Kent, AD 2005, Thermally induced magnetic switching in thin ferromagnetic annuli. in LB Kish, K Lindenberg & Z Gingl (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 5845, 03, pp. 1-11, Noise in Complex Systems and Stochastic Dynamics III, Austin, TX, United States, 5/24/05. https://doi.org/10.1117/12.610493
    Martens K, Stein DL, Kent AD. Thermally induced magnetic switching in thin ferromagnetic annuli. In Kish LB, Lindenberg K, Gingl Z, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 5845. 2005. p. 1-11. 03 https://doi.org/10.1117/12.610493
    Martens, Kirsten ; Stein, D. L. ; Kent, A. D. / Thermally induced magnetic switching in thin ferromagnetic annuli. Proceedings of SPIE - The International Society for Optical Engineering. editor / L.B. Kish ; K. Lindenberg ; Z. Gingl. Vol. 5845 2005. pp. 1-11
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