Correlation between spin structure oscillations and domain wall velocities

Magnetic sensing and logic devices based on the motion of magnetic domain walls rely on the precise and deterministic control of the position and the velocity of individual magnetic domain walls in curved nanowires. Varying domain wall velocities have been predicted to result from intrinsic effects...

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Vydané v:	Nature communications Ročník 4; číslo 1; s. 2328
Hlavní autori:	Bisig, André, Stärk, Martin, Mawass, Mohamad-Assaad, Moutafis, Christoforos, Rhensius, Jan, Heidler, Jakoba, Büttner, Felix, Noske, Matthias, Weigand, Markus, Eisebitt, Stefan, Tyliszczak, Tolek, Van Waeyenberge, Bartel, Stoll, Hermann, Schütz, Gisela, Kläui, Mathias
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	London Nature Publishing Group UK 27.08.2013 Nature Publishing Group Nature Pub. Group
Predmet:	639/766/119 639/925 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS Humanities and Social Sciences multidisciplinary NANOSCIENCE AND NANOTECHNOLOGY Science Science & Technology - Other Topics Science (multidisciplinary)
ISSN:	2041-1723, 2041-1723
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Popis
Shrnutí:	Magnetic sensing and logic devices based on the motion of magnetic domain walls rely on the precise and deterministic control of the position and the velocity of individual magnetic domain walls in curved nanowires. Varying domain wall velocities have been predicted to result from intrinsic effects such as oscillating domain wall spin structure transformations and extrinsic pinning due to imperfections. Here we use direct dynamic imaging of the nanoscale spin structure that allows us for the first time to directly check these predictions. We find a new regime of oscillating domain wall motion even below the Walker breakdown correlated with periodic spin structure changes. We show that the extrinsic pinning from imperfections in the nanowire only affects slow domain walls and we identify the magnetostatic energy, which scales with the domain wall velocity, as the energy reservoir for the domain wall to overcome the local pinning potential landscape. A prerequisite for using domain walls in logic or sensing devices is a thorough knowledge of the properties and precise control. Here the authors monitor the domain wall motion in curved nanowires by stroboscopic imaging and find a regime of oscillating velocity and spin structure below the Walker breakdown.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 content type line 14 ObjectType-Feature-2 content type line 23 AC02-05CH11231 USDOE Office of Science (SC), Basic Energy Sciences (BES)
ISSN:	2041-1723 2041-1723
DOI:	10.1038/ncomms3328