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Browsing Articole din publicaţii internaţionale by Author "ZDRAVKOV, V. I."

Browsing Articole din publicaţii internaţionale by Author "ZDRAVKOV, V. I."

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  • Cobalt/Cobaltoxide Exchange Bias System for Diluted Ferromagnetic Alloy Films in Superconducting Spin-Valves 
    SIDORENKO, A. S.; LENK, D.; ZDRAVKOV, V. I.; MORARI, R.; ULLRICH, A.; MÜLLER, C.; KRUG VON NIDDA, H.-A.; HORN, S.; TAGIROV, L. R.; TIDECKS, R. (Springer Nature Switzerland, 2016)
    The present work reports on the influence of a Cobalt sublayer on a conventional exchange bias CoOx/Cu41Ni59 interface. For superconducting spintronics the ability to exchange bias diluted ferromagnetic alloys is an essential ...
  • Critical temperature oscillations and reentrant superconductivity due to the FFLO like state in F/S/F trilayers 
    KEHRLE, J.; ZDRAVKOV, V. I.; OBERMEIER, G.; GARCIA-GARCIA, J.; ULLRICH, A.; MÜLLER, C.; MORARI, R.; SIDORENKO, A. S.; HORN, S.; TAGIROV, L. R.; TIDECKS, R. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2012)
    Ferromagnet/Superconductor/Ferromagnet (F/S/F) trilayers, in which the establishing of a Fulde-Ferrell Larkin-Ovchinnikov (FFLO) like state leads to interference effects of the superconducting pairing wave function, form ...
  • Experimental and theoretical analysis of the upper critical field in ferromagnet-superconductor-ferromagnet trilayers 
    ANTROPOV, E.; KALENKOV, M. S.; KEHRLE, J.; ZDRAVKOV, V. I.; MORARI, R.; SOCROVISCIUC, A.; LENK, D.; HORN, S.; TAGIROV, L. R.; ZAIKIN, A. D.; SIDORENKO, A. S.; HAHN, Horst; TIDECKS, R. (IOP Publishing, 2013)
    The upper critical magnetic field Hc2 in thin film ferromagnet–superconductor–ferromagnet trilayer spin-valve cores is studied experimentally and theoretically in geometries perpendicular and parallel to the heterostructure ...
  • Experimental observation of the triplet spin-valve effect in a superconductor-ferromagnet heterostructure 
    ZDRAVKOV, V. I.; KEHRLE, J.; OBERMEIER, G.; LENK, D.; KRUG VON NIDDA, H.-A.; MÜLLER, C.; KUPRIYANOV, M. Yu.; SIDORENKO, A. S.; HORN, S.; TIDECKS, R.; TAGIROV, L. R. (American Physical Society, 2013)
    The theory of superconductor-ferromagnet heterostructures with two ferromagnetic layers predicts the generation of a long-range, odd-in-frequency triplet pairing at noncollinear alignment (NCA) of the magnetizations of the ...
  • Extinction and Recovery of Superconductivity by Interference in Superconductor/Ferromagnet Bilayers 
    SIDORENKO, A. S.; ZDRAVKOV, V. I.; KEHRLE, J.; MORARI, R.; ANTROPOV, E.; OBERMEIER, G.; GSELL, S.; SCHRECK, M.; MÜLLER, C.; RYAZANOV, V. V.; HORN, S.; TIDECKS, R.; TAGIROV, L. R. (Springer Nature Switzerland, 2009)
    In superconductor–ferromagnet (S/F) metallic contacts, the superconducting condensate penetrates through the S/F interface into a ferromagnetic layer. In contrast to the conventional S/N proximity effect, the pairing wave ...
  • Fluctuation conductivity in superconducting MgB2 
    SIDORENKO, A. S.; TAGIROV, L. R.; ROSSOLENKO, A. N.; SIDOROV, N. S.; ZDRAVKOV, V. I.; RYAZANOV, V. V.; KLEMM, M.; HORN, S.; TIDECKS, R. (Springer Nature Switzerland, 2002)
    According to the crystal structure of MgB2 and band structure calculations, quasi-two-dimensional (2D) boron planes are responsible for the superconductivity. We report on critical-field and resistance measurements of ...
  • Full-switching FSF-type superconducting spin-triplet magnetic random access memory element 
    LENK, D.; MORARI, R.; ZDRAVKOV, V. I.; ULLRICH, A.; KHAYDUKOV, Yu; OBERMEIER, G.; MÜLLER, C.; SIDORENKO, A. S.; NIDDA von, H.-A. Krug; HORN, S.; TAGIROV, L. R.; TIDECKS, R. (American Physical Society, 2017)
    In the present work a superconducting Co/CoOx/Cu41Ni59/Nb/Cu41Ni59 nanoscale thin film heterostructure is investigated, which exhibits a superconducting transition temperature, Tc, depending on the history of magnetic field ...
  • Influence of the FFLO-like state on the upper critical field of a superconductor/ferromagnet bilayer: Angular and temperature dependence 
    LENK, D.; HEMMIDA, M.; MORARI, R.; ZDRAVKOV, V. I.; ULLRICH, A.; MÜLLER, C.; SIDORENKO, A. S.; HORN, S.; TAGIROV, L. R.; LOIDL, A.; NIDDA Von, H.-A. KRUG; TIDECKS, R. (American Physical Society, 2016)
    We investigated the upper critical magnetic field,Hc, of a superconductor-ferromagnet (S/F)bilayer of Nb/Cu41Ni59and a Nb film (as reference). We obtained the dependence ofHc⊥andHc‖(perpendicular and parallel to ...
  • Interference effects of the superconducting pairing wavefunction due to the Fulde-Ferrell-Larkin-Ovchinnikov like state in ferromagnet/superconductor bilayers 
    ZDRAVKOV, V. I.; KEHRLE, J.; OBERMEIER, G.; ULLRICH, A.; GSELL, S.; LENK, D.; MÜLLER, C.; MORARI, R.; SIDORENKO, A. S.; RYAZANOV, V. V.; TAGIROV, L. R.; TIDECKS, R.; HORN, S. (IOP Publishing, 2011)
    The theoretical description of the Fulde–Ferrell–Larkin–Ovchinnikov like state establishing in nanostructured bilayers of ferromagnetic (F) and superconducting (S) material leads to critical temperature oscillations and ...
  • Memory effect and triplet pairing generation in the superconducting exchange biased Co/CoOx/Cu41Ni59/Nb/Cu41Ni59 layered heterostructure 
    ZDRAVKOV, V. I.; LENK, D.; MORARI, R.; ULLRICH, A.; OBERMEIER, G.; MÜLLER, C.; NIDDA Von, H.-A. Krug; SIDORENKO, A. S.; HORN, S.; TIDECKS, R.; TAGIROV, L. R. (AIP Publishing LLC, 2013)
    We fabricated a nanolayered hybrid superconductor-ferromagnet spin-valve structure, the resistive state of which depends on the preceding magnetic field polarity. The effect is based on a strong exchange bias (about -2 ...
  • Observation of an fcc–Co nanolayer grown between CoO and amorphous Si 
    LENK, D.; ULLRICH, A.; ZDRAVKOV, V. I.; MORARI, R.; SIDORENKO, A. S.; HORN, S.; TIDECKS, R. (Springer Nature Switzerland, 2017)
    The thermodynamically crystallographic phase of Co at ambient conditions is hexagonal-close-packed. However, it has been found that given a crystallographic support from a suitable substrate, the high-temperature ...
  • Oscillations of the critical temperature in superconducting Nb/Ni bilayers 
    SIDORENKO, A. S.; ZDRAVKOV, V. I.; PREPELITSA, A. A.; HELBIG, C.; LUO, Y.; GSELL, S.; SCHRECK, M.; KLIMM, S.; HORN, S.; TAGIROV, L. R.; TIDECKS, R. (WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim, 2003)
    We investigated Nb/Ni bilayers prepared by magnetron sputtering on glass subtrates. The quality of the films was characterized by small-angle X-ray diffraction analysis. The thickness of the layers was determined by the ...
  • Quasi-one-dimensional FFLO state in the Nb/Ni layered system 
    SIDORENKO, A. S.; ZDRAVKOV, V. I.; PREPELITSA, A. A.; HELBIG, C.; LUO, Y.; GSELL, S.; SCHRECK, M.; KLIMM, S.; HORN, S.; TAGIROV, L. R.; TIDECKS, R. (Elservier, 2003)
    We investigated Nb/Ni bilayers prepared by DC magnetron sputtering on glass substrates. The quality of the films was characterized by small-angle X-ray diffraction analysis. The thickness of the layers was determined by ...
  • Quasi-one-dimensional Fulde-Ferrell-Larkin-Ovchinnikov-like state in Nb/Cu0.41Ni0.59 bilayers 
    SIDORENKO, A. S.; ZDRAVKOV, V. I.; KEHRLE, J.; MORARI, R.; OBERMEIER, G.; GSELL, S.; SCHRECK, M.; MÜLLER, C.; KUPRIYANOV, M. Yu.; RYAZANOV, V. V.; HORN, S.; TAGIROV, L. R.; TIDECKS, R. (Springer Nature Switzerland, 2009)
    In a ferromagnet (F) being in contact with a superconductor (S) an unconventional finite-momentum pairing of electrons forming Cooper pairs occurs. As a consequence, interference effects of the pairing wave function, leading ...
  • Reentrant superconductivity and superconducting critical temperature oscillations in F/S/F trilayers of Cu41Ni59/Nb/Cu41Ni59 grown on cobalt oxide 
    ZDRAVKOV, V. I.; KEHRLE, J.; LENK, D.; OBERMEIER, G.; ULLRICH, A.; MÜLLER, C.; NIDDA Von, H.-A. Krug; MORARI, R.; SIDORENKO, A. S.; TAGIROV, L. R.; HORN, S.; TIDECKS, R. (AIP Publishing LLC, 2013)
    Ferromagnet/Superconductor/Ferromagnet (F/S/F) trilayers constitute the core of a superconducting spin valve. The switching effect of the spin valve is based on interference phenomena occurring due to the proximity effect ...
  • Reentrant superconductivity in superconductor-ferromagnetic-alloy bilayers 
    ZDRAVKOV, V. I.; SIDORENKO, A. S.; OBERMEIER, G.; GSELL, S.; SCHRECK, M.; MÜLLER, C.; RYAZANOV, V. V.; HORN, S.; TIDECKS, R.; TAGIROV, L. R.; KUPRIYANOV, M. Yu. (Springer Nature Switzerland, 2008)
    Oscillating behavior of superconductivity in ultrathin bilayers of niobium and ferromagnetic alloy Cu41Ni59 has been observed. This phenomenon was most pronounced at a Nb layer thickness of about 7.3 nm: the superconducting ...
  • Reentrant superconductivity in superconductor/ferromagnetic-alloy bilayers 
    ZDRAVKOV, V. I.; KEHRLE, J.; OBERMEIER, G.; GSELL, S.; SCHRECK, M.; MÜLLER, C.; NIDDA Von, H.-A. Krug; LINDNER, J.; MOOSBURGER-WILL, J.; NOLD, E.; MORARI, R.; RYAZANOV, V. V.; SIDORENKO, A. S.; HORN, S.; TIDECKS, R.; TAGIROV, L. R. (American Physical Society, 2010)
    We studied the Fulde-Ferrell-Larkin-Ovchinnikov-type state established due to the proximity effect in superconducting Nb/Cu41Ni59 bilayers. Using a special wedge-type deposition technique, series of 20–35 samples could be ...
  • A Spin Valve Core Structure based on the Fulde-Ferrell Larkin-Ovchinnikov Like State: Studies on Bilayers and Trilayers of Superconductors and Ferromagnets 
    ZDRAVKOV, V. I.; KEHRLE, J.; OBERMEIER, G.; MÜLLER, C.; LENK, D.; MORARI, R.; SIDORENKO, A.; HORN, S.; TIDECKS, R.; TAGIROV, L. (IOP Publishing, 2012)
    Interference effects of the superconducting pairing wave function in thin film bilayers of Nb as a superconductor (S) and Cu41Ni59 as ferromagnetic (F) material lead to critical temperature oscillations and reentrant ...
  • Two-Dimensional Superconducting Fluctuations in MgB2 Films 
    SIDORENKO, A. S.; ZDRAVKOV, V. I.; RYAZANOV, V. V.; KLEMM, M.; HORN, S.; TIDECKS, R.; MÜLLER, C.; WIXFORTH, A. (Springer Nature Switzerland, 2004)
    The origin of the resistive transition broadening for superconducting MgB2 films is investigated experimentally. The crucial role of two-dimensional weak and critical fluctuations is demonstrated.

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