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      Fabrication and characterization of SmCo5/Nb ferromagnetic/superconducting hybrid thin films grown by RF magnetron sputtering technique

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      Embargo Lift Date: 2019-10-01
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      Author
      Ongun, E.
      Kuru, M.
      Serhatlıoğlu, M.
      Hançer, M.
      Ozmetin, A. E.
      Date
      2017
      Source Title
      Vacuum
      Print ISSN
      0042-207X
      Publisher
      Elsevier
      Volume
      144
      Pages
      116 - 124
      Language
      English
      Type
      Article
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      Abstract
      Ferromagnet/Superconductor (F/S) bilayer hybrids show exclusive states due to the mutual interaction between the superconductor and the underlying ferromagnetic substructures in micron scale. In this work, we aimed to observe the effects of the interaction between superconductivity and magnetism, especially the phenomenon involving the orientation and the size of magnetic stripes has been investigated in a coupled ferromagnetic/superconducting thin-film structure. In the proposed F/S hybrid system by this work, superconducting niobium thin-films were combined with underlying segments of ferromagnetic SmCo5 substructures. 300 nm thick magnetic films fabricated by RF magnetron sputtering techniques were topographically grown in patterns with stripes oriented either transverse to or along the direction of current flow. The elemental and microstructural analyses were conducted by EDX, SEM and GIXRD characterization tools. Low-temperature DC transport measurements were conducted by means of four point probe method in a 9T closed-cycle cryogenic refrigeration system. Transport superconducting properties, transition temperature TC(H) and second critical field HC2(T) were measured in a range of applied magnetic field between H = 0–9 kOe for the hybrid system. The results revealed that the artificial periodic modulation of applied field through preferentially-oriented magnetic stripes could introduce normal and superconducting channels or barriers for the current flow.
      Keywords
      Nb/SmCo5 superconductor/ferromagnet hybrids
      Superconducting thin-films
      Binary alloys
      Cobalt alloys
      Ferromagnetic materials
      Ferromagnetism
      Hybrid systems
      Magnetic thin films
      Magnetism
      Magnetron sputtering
      Magnetrons
      Niobium alloys
      Photolithography
      Refrigeration
      Superconducting films
      Superconductivity
      Temperature
      Thin films
      Applied magnetic fields
      Cryogenic refrigeration systems
      Fabrication and characterizations
      Four-point probe method
      Microstructural analysis
      RF magnetron sputtering technique
      Superconducting properties
      Superconductivity and magnetism
      Magnetic thick films
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      http://hdl.handle.net/11693/37317
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.vacuum.2017.07.024
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