Spin-torque-induced dynamics at fine-split frequencies in nano-oscillators with two stacked vortices

Nature Communications
V SlukaRiccardo Hertel

Abstract

The gyrotropic rotation around the equilibrium position constitutes the fundamental excitation of magnetic vortices in nanostructures. The frequency of this mode varies with material and sample geometry, but is independent of the vortex handedness and its core direction. Here, we demonstrate that this degeneracy is lifted in a spin-torque oscillator containing two vortices stacked on top of each other. When driven by spin-polarized currents, such devices exhibit a set of dynamic modes with discretely split frequencies, each corresponding to a specific combination of vorticities and relative core polarities. The fine splitting occurs even in the absence of external fields, demonstrating that such devices can function as zero-field, multi-channel, nano-oscillators for communication technologies. It also facilitates the detection of the relative core polarization and allows for the eight non-degenerate configurations to be distinguished electrically, which may enable the design of multi-state memory devices based on double-vortex nanopillars.

References

Oct 19, 2002·Science·A WachowiakR Wiesendanger
Nov 9, 2004·Nature Materials·Kyung-Jin LeeBernard Dieny
Jul 23, 2008·Physical Review Letters·Q MistralT Schrefl
Dec 31, 2008·Physical Review Letters·Michael CurcicGisela Schütz
Aug 8, 2009·Nature Nanotechnology·A RuotoloA Fert
Oct 27, 2010·Nature Communications·Johan H van EsBassem A Hassan
May 24, 2011·Physical Review Letters·X W YuJ Stöhr
Jun 15, 2011·Physical Review Letters·Satoshi SugimotoYoshichika Otani
Sep 26, 2012·Physical Review Letters·S S CherepovV Korenivski
Dec 29, 2012·Nature Communications·S JainS D Bader

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Citations

Mar 5, 2016·Scientific Reports·Max HänzeGuido Meier
Nov 15, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·C H ChenW J Hsueh
Oct 27, 2018·Scientific Reports·A G KolesnikovOleg A Tretiakov
Jul 1, 2017·Physical Review Letters·Yi LiGrégoire de Loubens

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