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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2008, Volume 87, Issue 3, Pages 204–209
(Mi jetpl37)
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This article is cited in 14 scientific papers (total in 14 papers)
CONDENSED MATTER
Change in the sign of the magnetoresistance effect in bilayer superconductor/ferromagnet structures under change in the type of the domain structure in the ferromagnet
A. Yu. Rusanov, T. E. Golikova, S. V. Egorov Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia
Abstract:
The magnetoresistance effects in the bi- and trilayer hybrid planar superconductor/ferromagnet (S/F) structures based on Py (permalloy) and Nb near the superconducting transition temperature T C are considered. It has been experimentally shown that the sign of the observed magnetoresistance peaks in the bilayer S/F systems changes from negative to positive at the permalloy layer thickness corresponding to the change in the type of domain walls from Néel to Bloch. For the Néel walls at the ferromagnet coercive fields, the negative magnetoresistance effect, which is due to a decrease in the depairing action of the exchange field E ex, is observed in the S/F bilayers. For the Bloch domain walls, the magnetoresistance of the bilayer S/F structures is determined by the dissipative motion of Abrikosov vortices in the superconducting layer. In the trilayer F/S/F structures, the magnetoresistance is mainly due to the suppression of the superconducting order parameter in the superconducting layer under the action of the accumulation of the spin-polarized carriers near the S/F interfaces.
Received: 09.01.2007
Citation:
A. Yu. Rusanov, T. E. Golikova, S. V. Egorov, “Change in the sign of the magnetoresistance effect in bilayer superconductor/ferromagnet structures under change in the type of the domain structure in the ferromagnet”, Pis'ma v Zh. Èksper. Teoret. Fiz., 87:3 (2008), 204–209; JETP Letters, 87:3 (2008), 175–180
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https://www.mathnet.ru/eng/jetpl37 https://www.mathnet.ru/eng/jetpl/v87/i3/p204
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