Topological repulsion between domain walls in magnetic nanowires leading to the formation of bound states

Luc Thomas (), Masamitsu Hayashi, Rai Moriya, Charles Rettner and Stuart Parkin ()
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Luc Thomas: IBM Almaden Research Center
Masamitsu Hayashi: IBM Almaden Research Center
Rai Moriya: IBM Almaden Research Center
Charles Rettner: IBM Almaden Research Center
Stuart Parkin: IBM Almaden Research Center

Nature Communications, 2012, vol. 3, issue 1, 1-7

Abstract: Abstract Head-to-head and tail-to-tail magnetic domain walls in nanowires behave as free magnetic monopoles carrying a single magnetic charge. Since adjacent walls always carry opposite charges, they attract one another. In most cases this long-range attractive interaction leads to annihilation of the two domain walls. Here, we show that, in some cases, a short-range repulsive interaction suppresses annihilation of the walls, even though the lowest energy state is without any domain walls. This repulsive interaction is a consequence of topological edge defects that have the same winding number. We show that the competition between the attractive and repulsive interactions leads to the formation of metastable bound states made up of two or more domain walls. We have created bound states formed from up to eight domain walls, corresponding to the magnetization winding up over four complete 360° rotations.

Date: 2012
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DOI: 10.1038/ncomms1808

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