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001     17398
005     20190625111507.0
024 7 _ |2 DOI
|a 10.1088/0022-3727/44/38/384002
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041 _ _ |a eng
082 _ _ |a 530
084 _ _ |2 WoS
|a Physics, Applied
100 1 _ |0 P:(DE-Juel1)VDB81618
|a Sluka, V.
|b 0
|u FZJ
245 _ _ |a Spin-Transfer Torque Induced Vortex Dynamics in Fe/Ag/Fe Nanopillars
260 _ _ |a Bristol
|b IOP Publ.
|c 2011
300 _ _ |a 384002
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|a article
440 _ 0 |0 3700
|a Journal of Physics D - Applied Physics
|v 44
|x 0022-3727
|y 38
500 _ _ |3 POF3_Assignment on 2016-02-29
500 _ _ |a A M D acknowledges financial support from the EU project STraDy (MOIF-CT-2006-039772).
520 _ _ |a We 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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700 1 _ |0 P:(DE-Juel1)VDB63661
|a Kakay, A.
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700 1 _ |0 P:(DE-Juel1)VDB102039
|a Deac, A. M.
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700 1 _ |0 P:(DE-Juel1)130582
|a Burgler, D. E.
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700 1 _ |0 P:(DE-Juel1)VDB57937
|a Hertel, R.
|b 4
|u FZJ
700 1 _ |0 P:(DE-Juel1)130948
|a Schneider, C. M.
|b 5
|u FZJ
773 _ _ |0 PERI:(DE-600)1472948-9
|a 10.1088/0022-3727/44/38/384002
|g Vol. 44, p. 384002
|p 384002
|q 44<384002
|t Journal of physics / D
|v 44
|x 0022-3727
|y 2011
856 7 _ |u http://dx.doi.org/10.1088/0022-3727/44/38/384002
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