Time resolved transport studies of magnetization reversal in orthogonal spin transfer magnetic tunnel junction devices

Georg Wolf, Gabriel Chaves-O'Flynn, Andrew D. Kent, Bartek Kardasz, Steve Watts, Mustafa Pinarbasi

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

    Abstract

    In this work we report on time resolved magnetization reversal driven by spin transfer torque in an orthogonal spin transfer (OST) magnetic tunnel junction device. We focus on the transitions from parallel (P) to antiparallel (AP) states and the reverse transitions (AP to P) under the influence of 10 ns voltage pulses. The electrical response is monitored with a fast real-time oscilloscope and thus timing information of the reversal process is obtained. The P to AP transition switching time decreases with increasing current and shows only direct switching behavior. The AP to P transition shows similar behavior, but has a broader distribution of switching times at high currents. The rare AP to P switching events that occur at later times are due to the occurrence of a pre-oscillation, which could be identified in time resolve voltage traces. A possible origin of these pre-oscillations is seen in micromagnetic simulations, where they are associated with the breakdown of the uniform precession of the magnetization, and lead to reversal of the magnetization at later times.

    Original languageEnglish (US)
    Title of host publicationSpintronics VII
    EditorsHenri-Jean Drouhin, Jean-Eric Wegrowe, Manijeh Razeghi
    PublisherSPIE
    ISBN (Electronic)9781628411942
    DOIs
    StatePublished - 2014
    EventSpintronics VII - San Diego, United States
    Duration: Aug 17 2014Aug 21 2014

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    Volume9167
    ISSN (Print)0277-786X
    ISSN (Electronic)1996-756X

    Other

    OtherSpintronics VII
    CountryUnited States
    CitySan Diego
    Period8/17/148/21/14

    Keywords

    • MRAM
    • Orthogonal spin transfer
    • Time resolved magnetization reversal

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering

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