Synchronous precessional motion of multiple domain walls in a ferromagnetic nanowire by perpendicular field pulses

June-Seo Kim, Mohamad-Assaad Mawass, André Bisig, Benjamin Krüger, Robert M. Reeve, Tomek Schulz, Felix Büttner, Jungbum Yoon, Chun-Yeol You (), Markus Weigand, Hermann Stoll, Gisela Schütz, Henk J. M. Swagten, Bert Koopmans, Stefan Eisebitt and Mathias Kläui ()
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June-Seo Kim: Institut für Physik, Johannes Gutenberg-Universität Mainz
Mohamad-Assaad Mawass: Institut für Physik, Johannes Gutenberg-Universität Mainz
André Bisig: Institut für Physik, Johannes Gutenberg-Universität Mainz
Benjamin Krüger: Institut für Physik, Johannes Gutenberg-Universität Mainz
Robert M. Reeve: Institut für Physik, Johannes Gutenberg-Universität Mainz
Tomek Schulz: Institut für Physik, Johannes Gutenberg-Universität Mainz
Felix Büttner: Institut für Physik, Johannes Gutenberg-Universität Mainz
Jungbum Yoon: Inha University
Chun-Yeol You: Inha University
Markus Weigand: Max Planck Institute for Intelligent Systems
Hermann Stoll: Max Planck Institute for Intelligent Systems
Gisela Schütz: Max Planck Institute for Intelligent Systems
Henk J. M. Swagten: Center for NanoMaterials, Eindhoven University of Technology
Bert Koopmans: Center for NanoMaterials, Eindhoven University of Technology
Stefan Eisebitt: Institut für Optik und Atomare Physik, Technische Universität Berlin
Mathias Kläui: Institut für Physik, Johannes Gutenberg-Universität Mainz

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Magnetic storage and logic devices based on magnetic domain wall motion rely on the precise and synchronous displacement of multiple domain walls. The conventional approach using magnetic fields does not allow for the synchronous motion of multiple domains. As an alternative method, synchronous current-induced domain wall motion was studied, but the required high-current densities prevent widespread use in devices. Here we demonstrate a radically different approach: we use out-of-plane magnetic field pulses to move in-plane domains, thus combining field-induced magnetization dynamics with the ability to move neighbouring domain walls in the same direction. Micromagnetic simulations suggest that synchronous permanent displacement of multiple magnetic walls can be achieved by using transverse domain walls with identical chirality combined with regular pinning sites and an asymmetric pulse. By performing scanning transmission X-ray microscopy, we are able to experimentally demonstrate in-plane magnetized domain wall motion due to out-of-plane magnetic field pulses.

Date: 2014
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DOI: 10.1038/ncomms4429

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