Spintronics: A nanomagnet oscillator

Andrew D. Kent

    Research output: Contribution to journalShort surveypeer-review

    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

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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