caa a22 4500 445381167 CHVBK 20180317143017.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-0880-z doi (NATIONALLICENCE)springer-10.1007/s10948-010-0880-z Anisotropic Superconductivity and Vortex Dynamics inMagnetically Coupled F/S and F/S/F Hybrids [Elektronische Daten] [G. Karapetrov, A. Belkin, M. Iavarone, J. Fedor, V. Novosad, M. Milošević, F. Peeters] Magnetically coupled superconductor-ferromagnet hybrids offer advanced routes for nanoscale control of superconductivity. Magnetotransport characteristics and scanning tunneling microscopy images of vortex structures in superconductor-ferromagnet hybrids reveal rich superconducting phase diagrams. Focusing on a particular combination of a ferromagnet with a well-ordered periodic magnetic domain structure with alternating out-of-plane component of magnetization, and a small coherence length superconductor, we find directed nucleation of superconductivity above the domain wall boundaries. We show that near the superconductor-normal state phase boundary the superconductivity is localized in narrow mesoscopic channels. In order to explore the Abrikosov flux line ordering in F/S hybrids, we use a combination of scanning tunneling microscopy and Ginzburg-Landau simulations. The magnetic stripe domain structure induces periodic local magnetic induction in the superconductor, creating a series of pinning-anti-pinning channels for externally added magnetic flux quanta. Such laterally confined Abrikosov vortices form quasi-1D arrays (chains). The transitions between multichain states occur through propagation of kinks at the intermediate fields. At high fields we show that the system becomes nonlinear due to a change in both the number of vortices and the confining potential. In F/S/F hybrids we demonstrate the evolution of the anisotropic conductivity in the superconductor that is magnetically coupled with two adjacent ferromagnetic layers. Stripe magnetic domain structures in both F-layers are aligned under each other, resulting in a directional superconducting order parameter in the superconducting layer. The conductance anisotropy strongly depends on the period of the magnetic domains and the strength of the local magnetization. The anisotropic conductivity of up to three orders of magnitude can be achieved with a spatial critical temperature modulation of 5% of T c. Induced anisotropic properties in the F/S and F/S/F hybrids have a potential for future application in switching and nonvolatile memory elements operating at low temperatures. Springer Science+Business Media, LLC, 2010 Superconductor ferromagnet hybrids nationallicence Vortex dynamics nationallicence Scanning tunneling microscopy nationallicence Vortex chains nationallicence Superconducting anisotropy nationallicence Karapetrov G. Materials Science Division, Argonne National Laboratory, 60439, Argonne, IL, USA aut Belkin A. Materials Science Division, Argonne National Laboratory, 60439, Argonne, IL, USA aut Iavarone M. Materials Science Division, Argonne National Laboratory, 60439, Argonne, IL, USA aut Fedor J. Materials Science Division, Argonne National Laboratory, 60439, Argonne, IL, USA aut Novosad V. Materials Science Division, Argonne National Laboratory, 60439, Argonne, IL, USA aut Milošević M. Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, 2020, Antwerpen, Belgium aut Peeters F. Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, 2020, Antwerpen, Belgium aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 905-910 1557-1939 24:1-2<905 2011 24 10948 https://doi.org/10.1007/s10948-010-0880-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0880-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Karapetrov G. Materials Science Division, Argonne National Laboratory, 60439, Argonne, IL, USA aut NATIONALLICENCE 700 1- Belkin A. Materials Science Division, Argonne National Laboratory, 60439, Argonne, IL, USA aut NATIONALLICENCE 700 1- Iavarone M. Materials Science Division, Argonne National Laboratory, 60439, Argonne, IL, USA aut NATIONALLICENCE 700 1- Fedor J. Materials Science Division, Argonne National Laboratory, 60439, Argonne, IL, USA aut NATIONALLICENCE 700 1- Novosad V. Materials Science Division, Argonne National Laboratory, 60439, Argonne, IL, USA aut NATIONALLICENCE 700 1- Milošević M. Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, 2020, Antwerpen, Belgium aut NATIONALLICENCE 700 1- Peeters F. Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, 2020, Antwerpen, Belgium aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 905-910 1557-1939 24:1-2<905 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer