Giant anisotropy of the resistance induced by magnetic domains in superconductor/ferromagnet hybrids |
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Authors: | A.Yu. Aladyshkin J. Fritzsche V.V. Moshchalkov |
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Affiliation: | 1. INPAC – Institute for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism and Pulsed Fields Group, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B–3001 Leuven, Belgium;2. Institute for Physics of Microstructures, Russian Academy of Sciences, 603950 Nizhny Novgorod, GSP-105, Russia |
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Abstract: | We experimentally studied the magnetoresistance of a superconducting Al microbridge fabricated on top of a ferromagnetic BaFe12O19 single crystal. Due to the presence of a one-dimensional domain structure in the ferromagnetic substrate, the superconducting critical temperature reaches its maximal value at the compensation field, |H|?B0, when superconductivity nucleates above magnetic domains of opposite polarity with respect to the applied magnetic field H (so-called reverse-domain superconductivity, B0 being the amplitude of the z-component of the nonuniform magnetic field). Such localized superconductivity makes it possible to transfer superconducting currents without dissipation only along the magnetic domains, leading to a pronounced anisotropy of the resistance of this system at low temperatures. |
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Keywords: | Superconductor-ferromagnet hybrid Reverse-domain superconductivity Anisotropy of resistance |
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