Non-planar spin texture driven dissipation in a ferromagnet-superconductor bilayer |
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Authors: | Gyanendra SinghPC Joshi RC Budhani |
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Institution: | a Condensed Matter-Low Dimensional Systems Laboratory, Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208 016, India b National Physical Laboratory, New Delhi 110 012, India |
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Abstract: | We report the observation of a pronounced dip in the in-plane magnetic field (H∥) dependence of the critical current density Jc(H) and a peak in resistance R(H) of a NbN-HoNi5 bilayer at temperatures below the magnetic ordering temperature (TCurie ≈ 3.5 K) of HoNi5, which is lower than the onset temperature (≈9 K) of superconductivity in the NbN layer. The extrema in Jc(H) and R(H) appear at fields much below the upper critical field of NbN. We attribute these features to a coupling between localized out-of-plane moments present in the magnetic film and Pearl vortices of the superconducting layer. A spin re-orientation transition of the localized moments by H∥ breaks this coupling, leading to the observed excess dissipation. |
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Keywords: | Spin reorientation transition Superconductor-ferromagnet heterostructures Vortex pinning |
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