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000017398 0247_ $$2DOI$$a10.1088/0022-3727/44/38/384002
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000017398 084__ $$2WoS$$aPhysics, Applied
000017398 1001_ $$0P:(DE-Juel1)VDB81618$$aSluka, V.$$b0$$uFZJ
000017398 245__ $$aSpin-Transfer Torque Induced Vortex Dynamics in Fe/Ag/Fe Nanopillars
000017398 260__ $$aBristol$$bIOP Publ.$$c2011
000017398 300__ $$a384002
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000017398 440_0 $$03700$$aJournal of Physics D - Applied Physics$$v44$$x0022-3727$$y38
000017398 500__ $$3POF3_Assignment on 2016-02-29
000017398 500__ $$aA M D acknowledges financial support from the EU project STraDy (MOIF-CT-2006-039772).
000017398 520__ $$aWe report on the experimental and analytical work on spin-transfer torque induced vortex dynamics in metallic nanopillars with in-plane magnetized layers. We study nanopillars with a diameter of 150 nm, containing two Fe layers with a thickness of 15 nm and 30 nm, respectively, separated by a 6 nm Ag spacer. The sample geometry is such that it allows for the formation of magnetic vortices in the Fe discs. As confirmed by micromagnetic simulations, we are able to prepare states where one magnetic layer is homogeneously magnetized while the other contains a vortex. We experimentally show that in this configuration spin-transfer torque can excite vortex dynamics and analyse their dependence on a magnetic field applied in the sample plane. The centre of gyration is continuously dislocated from the disc centre, and the potential changes its shape with field strength. The latter is reflected in the field dependence of the excitation frequency. In the second part we propose a novel mechanism for the excitation of the gyrotropic mode in nanopillars with a perfectly homogeneously magnetized in-plane polarizing layer. We analytically show that in this configuration the vortex can absorb energy from the spin-polarized electric current if the angular spin-transfer efficiency function is asymmetric. This effect is supported by micromagnetic simulations.
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000017398 7001_ $$0P:(DE-Juel1)VDB63661$$aKakay, A.$$b1$$uFZJ
000017398 7001_ $$0P:(DE-Juel1)VDB102039$$aDeac, A. M.$$b2$$uFZJ
000017398 7001_ $$0P:(DE-Juel1)130582$$aBurgler, D. E.$$b3$$uFZJ
000017398 7001_ $$0P:(DE-Juel1)VDB57937$$aHertel, R.$$b4$$uFZJ
000017398 7001_ $$0P:(DE-Juel1)130948$$aSchneider, C. M.$$b5$$uFZJ
000017398 773__ $$0PERI:(DE-600)1472948-9$$a10.1088/0022-3727/44/38/384002$$gVol. 44, p. 384002$$p384002$$q44<384002$$tJournal of physics / D$$v44$$x0022-3727$$y2011
000017398 8567_ $$uhttp://dx.doi.org/10.1088/0022-3727/44/38/384002
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