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 No.2(pp.53-100) |
Home > Issues > Volume 14 (2009) > No.2(pp.53-100) |
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| Concepts for Domain Wall Motion in Nanoscale Ferromagnetic Elements due to Spin Torque and in Particular Oersted Fields |
| Journal of Magnetics, Volume 14, Number 2, 30 Jun 2009, Pages 53-61 |
Mathias Kläui*  (Fachbereich Physik, Universität Konstanz, Universitätsstr.), Dennis Ilgaz(Fachbereich Physik, Universität Konstanz, Universitätsstr.), Lutz Heyne(Fachbereich Physik, Universität Konstanz, Universitätsstr.), June-Seo Kim(Fachbereich Physik, Universität Konstanz, Universitätsstr.), Olivier Boulle(Fachbereich Physik, Universität Konstanz, Universitätsstr.), Christine Schieback(Fachbereich Physik, Universität Konstanz, Universitätsstr.), Fabian Zinser(Fachbereich Physik, Universität Konstanz, Universitätsstr.), Stephen Krzyk(Fachbereich Physik, Universität Konstanz, Universitätsstr.), Mikhail Fonin(Fachbereich Physik, Universität Konstanz, Universitätsstr.), Ulrich Rüdiger(Fachbereich Physik, Universität Konstanz, Universitätsstr.), Dirk Backes(Fachbereich Physik, Universität Konstanz, Universitätsstr.), Laura J. Heyderman(Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut), T. O. Mentes(Sincrotrone Trieste S.C.p.A.), A. Locatelli(Sincrotrone Trieste S.C.p.A.) |
| Abstract |
| Herein, different concepts for domain wall propagation based on currents and fields that could potentially be used in magnetic data storage devices based on domains and domain walls are reviewed. By direct imaging, we show that vortex and transverse walls can be displaced using currents due to the spin transfer torque effect. For the case of field-induced wall motion, particular attention is paid to the influence of localized fields and local heating on the depinning and propagation of domain walls. Using an Au nanowire adjacent to a permalloy structure with a domain wall, the depinning field of the wall, when current pulses are injected into the Au nanowire, was studied. The current pulse drastically modified the depinning field, which depended on the interplay between the externally applied field direction and polarity of the current, leading subsequently to an Oersted field and heating of the permalloy at the interface with the Au wire. Placing the domain wall at various distances from the Au wire and studying different wall propagation directions, the range of Joule heating and Oersted field was determined; both effects could be separated. Approaches beyond conventional field- and current- induced wall displacement are briefly discussed. |
| Keywords: domain wall motion; oersted field induced domain wall dynamics; magnetic shift register; joule heating; spin torque |
| DOI: 10.4283/JMAG.2009.14.2.53 |
| Full Text: PDF |
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