Fast current-induced domain-wall motion controlled by the Rashba effect View Full Text


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Article Info

DATE

2011-06

AUTHORS

Ioan Mihai Miron, Thomas Moore, Helga Szambolics, Liliana Daniela Buda-Prejbeanu, Stéphane Auffret, Bernard Rodmacq, Stefania Pizzini, Jan Vogel, Marlio Bonfim, Alain Schuhl, Gilles Gaudin

ABSTRACT

The propagation of magnetic domain walls induced by spin-polarized currents has launched new concepts for memory and logic devices. A wave of studies focusing on permalloy (NiFe) nanowires has found evidence for high domain-wall velocities (100 m s(-1); refs,), but has also exposed the drawbacks of this phenomenon for applications. Often the domain-wall displacements are not reproducible, their depinning from a thermally stable position is difficult and the domain-wall structural instability (Walker breakdown) limits the maximum velocity. Here, we show that the combined action of spin-transfer and spin-orbit torques offers a comprehensive solution to these problems. In an ultrathin Co nanowire, integrated in a trilayer with structural inversion asymmetry (SIA), the high spin-torque efficiency facilitates the depinning and leads to high mobility, while the SIA-mediated Rashba field controlling the domain-wall chirality stabilizes the Bloch domain-wall structure. Thus, the high-mobility regime is extended to higher current densities, allowing domain-wall velocities up to 400 m s(-1). More... »

PAGES

419

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nmat3020

DOI

http://dx.doi.org/10.1038/nmat3020

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1020087497

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/21572411


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