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
    PublisherSPIE
    Volume9167
    ISBN (Print)9781628411942
    DOIs
    StatePublished - 2014
    EventSpintronics VII - San Diego, United States
    Duration: Aug 17 2014Aug 21 2014

    Other

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

    Fingerprint

    Magnetization reversal
    Tunnel junctions
    Antiparallel
    Tunnel
    Reversal
    tunnel junctions
    Magnetization
    magnetization
    Electric potential
    Voltage
    Oscillation
    Micromagnetics
    Torque
    oscillations
    oscilloscopes
    electric potential
    Breakdown
    Reverse
    Timing
    precession

    Keywords

    • MRAM
    • Orthogonal spin transfer
    • Time resolved magnetization reversal

    ASJC Scopus subject areas

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

    Cite this

    Wolf, G., Chaves-O'Flynn, G., Kent, A. D., Kardasz, B., Watts, S., & Pinarbasi, M. (2014). Time resolved transport studies of magnetization reversal in orthogonal spin transfer magnetic tunnel junction devices. In Spintronics VII (Vol. 9167). [91671H] SPIE. https://doi.org/10.1117/12.2062837

    Time resolved transport studies of magnetization reversal in orthogonal spin transfer magnetic tunnel junction devices. / Wolf, Georg; Chaves-O'Flynn, Gabriel; Kent, Andrew D.; Kardasz, Bartek; Watts, Steve; Pinarbasi, Mustafa.

    Spintronics VII. Vol. 9167 SPIE, 2014. 91671H.

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

    Wolf, G, Chaves-O'Flynn, G, Kent, AD, Kardasz, B, Watts, S & Pinarbasi, M 2014, Time resolved transport studies of magnetization reversal in orthogonal spin transfer magnetic tunnel junction devices. in Spintronics VII. vol. 9167, 91671H, SPIE, Spintronics VII, San Diego, United States, 8/17/14. https://doi.org/10.1117/12.2062837
    Wolf G, Chaves-O'Flynn G, Kent AD, Kardasz B, Watts S, Pinarbasi M. Time resolved transport studies of magnetization reversal in orthogonal spin transfer magnetic tunnel junction devices. In Spintronics VII. Vol. 9167. SPIE. 2014. 91671H https://doi.org/10.1117/12.2062837
    Wolf, Georg ; Chaves-O'Flynn, Gabriel ; Kent, Andrew D. ; Kardasz, Bartek ; Watts, Steve ; Pinarbasi, Mustafa. / Time resolved transport studies of magnetization reversal in orthogonal spin transfer magnetic tunnel junction devices. Spintronics VII. Vol. 9167 SPIE, 2014.
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