Stable magnetic droplet solitons in spin-transfer nanocontacts

Ferran Macià, Dirk Backes, Andrew D. Kent

    Research output: Contribution to journalArticle

    Abstract

    Magnetic thin films with perpendicular magnetic anisotropy have localized excitations that correspond to reversed, dynamically precessing magnetic moments, which are known as magnetic droplet solitons. Fundamentally, these excitations are associated with an attractive interaction between elementary spin-excitations and have been predicted to occur in perpendicularly magnetized materials in the absence of damping1,2. Although damping suppresses these excitations, it can be compensated by spin-transfer torques when an electrical current flows in nanocontacts to ferromagnetic thin films3,4. Theory predicts the appearance of magnetic droplet solitons in nanocontacts at a threshold current5 and, recently, experimental signatures of droplet nucleation have been reported6. However, to date, these solitons have been observed to be nearly reversible excitations, with only partially reversed magnetization. Here, we show that magnetic droplet solitons exhibit a strong hysteretic response in field and current, proving the existence of bistable states: droplet and non-droplet states. In the droplet soliton state we find that the magnetization in the contact is almost fully reversed. These observations, in addition to their fundamental interest, are important to understanding and controlling droplet motion, nucleation and annihilation7-9.

    Original languageEnglish (US)
    Pages (from-to)992-996
    Number of pages5
    JournalNature Nanotechnology
    Volume9
    Issue number12
    DOIs
    StatePublished - Jan 1 2014

    Fingerprint

    Solitons
    solitary waves
    excitation
    nucleation
    magnetization
    Magnetization
    Nucleation
    Magnetic thin films
    torque
    Magnetic anisotropy
    magnetic moments
    damping
    signatures
    Magnetic moments
    anisotropy
    thresholds
    Torque
    Damping
    thin films
    interactions

    ASJC Scopus subject areas

    • Bioengineering
    • Biomedical Engineering
    • Materials Science(all)
    • Electrical and Electronic Engineering
    • Condensed Matter Physics
    • Atomic and Molecular Physics, and Optics

    Cite this

    Stable magnetic droplet solitons in spin-transfer nanocontacts. / Macià, Ferran; Backes, Dirk; Kent, Andrew D.

    In: Nature Nanotechnology, Vol. 9, No. 12, 01.01.2014, p. 992-996.

    Research output: Contribution to journalArticle

    Macià, Ferran ; Backes, Dirk ; Kent, Andrew D. / Stable magnetic droplet solitons in spin-transfer nanocontacts. In: Nature Nanotechnology. 2014 ; Vol. 9, No. 12. pp. 992-996.
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