Spintronics

A nanomagnet oscillator

Andrew D. Kent

    Research output: Contribution to journalArticle

    Abstract

    Large-amplitude magnetic-oscillations on a current-tunable microwave oscillator at low currents without the need for an applied magnetic field are demonstrated. Two magnetic layers are used as a polarizer-analyzer combination for electron spin, similar to light passing through a set of polarizing filters. A parallel state of alignment of polarizer and analyzer magnetizations shows that there is a high transmission of spin-polarized electrons, which results in low-resistance state. The torque on a microwave oscillator causes a dynamical response of the system, leading to a reversal of magnetization direction and high-frequency precision of the magnetization. Layers that intrinsically prefer a perpendicular polarization are used to create perpendicular magnetization in the free layers in an oscillator. Large microwave signals in a current-tunable oscillator are generated that increase output level of the oscillator.

    Original languageEnglish (US)
    Pages (from-to)399-400
    Number of pages2
    JournalNature Materials
    Volume6
    Issue number6
    DOIs
    StatePublished - Jun 2007

    Fingerprint

    Magnetoelectronics
    Magnetization
    oscillators
    Microwave oscillators
    microwave oscillators
    magnetization
    polarizers
    analyzers
    Electrons
    low resistance
    low currents
    electron spin
    torque
    Torque
    alignment
    Microwaves
    Polarization
    Magnetic fields
    filters
    microwaves

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Spintronics : A nanomagnet oscillator. / Kent, Andrew D.

    In: Nature Materials, Vol. 6, No. 6, 06.2007, p. 399-400.

    Research output: Contribution to journalArticle

    Kent, Andrew D. / Spintronics : A nanomagnet oscillator. In: Nature Materials. 2007 ; Vol. 6, No. 6. pp. 399-400.
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