6 September 2000 Spontaneous currents in superconductor/ferromagnetic devices
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We study theoretically the Josephson coupling in a ferromagnetic weak link between both isotropic s-wave, and layered d-wave superconductors. For strong ferromagnetic barrier influence, the conventional coupling is obtained, with ground state phase difference across the link 0 < (phi) gs <EQ (pi) . When the weak link is a part of a superconducting ring, this is accompanied by the flow of spontaneous supercurrent, of intensity which depends on the reduced inductance l equals 2(pi) LIc(T)/(Phi) 0, and is non-zero only for l greater than a critical value. For l >> 1, another consequence of the unconventional coupling is the anomalous quantization of the magnetic flux.
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Zoran Radovic, Zoran Radovic, Ljiljana Dobrosavljevic-Grujic, Ljiljana Dobrosavljevic-Grujic, B. Vujicic, B. Vujicic, "Spontaneous currents in superconductor/ferromagnetic devices", Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); doi: 10.1117/12.397826; https://doi.org/10.1117/12.397826


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