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000280559 1001_ $$0P:(DE-HGF)0$$aSluka, V.$$b0$$eCorresponding author
000280559 245__ $$aSpin-torque-induced dynamics at fine-split frequencies in nano-oscillators with two stacked vortices
000280559 260__ $$aLondon$$bNature Publishing Group$$c2015
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000280559 520__ $$aThe gyrotropic rotation around the equilibrium position constitutes the fundamental excitation of magnetic vortices in nanostructures. The frequency of this mode varies with material and sample geometry, but is independent of the vortex handedness and its core direction. Here, we demonstrate that this degeneracy is lifted in a spin-torque oscillator containing two vortices stacked on top of each other. When driven by spin-polarized currents, such devices exhibit a set of dynamic modes with discretely split frequencies, each corresponding to a specific combination of vorticities and relative core polarities. The fine splitting occurs even in the absence of external fields, demonstrating that such devices can function as zero-field, multi-channel, nano-oscillators for communication technologies. It also facilitates the detection of the relative core polarization and allows for the eight non-degenerate configurations to be distinguished electrically, which may enable the design of multi-state memory devices based on double-vortex nanopillars.
000280559 536__ $$0G:(DE-HGF)POF3-522$$a522 - Controlling Spin-Based Phenomena (POF3-522)$$cPOF3-522$$fPOF III$$x0
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000280559 7001_ $$0P:(DE-Juel1)130747$$aKákay, A.$$b1$$eCorresponding author
000280559 7001_ $$0P:(DE-HGF)0$$aDeac, A. M.$$b2
000280559 7001_ $$0P:(DE-HGF)0$$aBürgler, D. E.$$b3
000280559 7001_ $$0P:(DE-Juel1)130948$$aSchneider, C. M.$$b4
000280559 7001_ $$0P:(DE-Juel1)130709$$aHertel, R.$$b5
000280559 773__ $$0PERI:(DE-600)2553671-0$$a10.1038/ncomms7409$$gVol. 6, p. 6409 -$$p6409 -$$tNature Communications$$v6$$x2041-1723$$y2015
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