Vortex-Antivortex coexistence in Nb based Superconductor/Ferromagnet heterostructures
ORAL
Abstract
Superconductor/Ferromagnet thin film heterostructures, based on Niobium/Permalloy (Nb/Py), have been studied by low temperature Magnetic Force Microscopy. The experimental observation of spontaneous Vortex-Antivortex in these systems depends on the Nb penetration depth and thickness, on the intensity of the Py stray field induced by the small, alternating up-and-down, out-of-plane component $M_0$, and the width of the Py stripe-like magnetic domains. Comparison with the available theoretical models allows to estimate the threshold of the local $M_0$ for different Py thicknesses.
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Authors
C. Di Giorgio
E.R. Caianiello Physics Department, University of Salerno, IT; Physics Department, Temple University, Philadelphia, PA
F. Bobba
E.R. Caianiello Physics Department, University of Salerno, IT
A. Scarfato
Department of Condensed Matter Physics, University of Geneva, CH
M. Longobardi
Department of Condensed Matter Physics, University of Geneva, CH
M. Iavarone
Physics Department, Temple University, Philadelphia, PA
S.A. Moore
Physics Department, Temple University, Philadelphia, PA
G. Karapetrov
Physics Department, Drexel University, Philadelphia, PA
V. Novosad
Materials Science Division, Argonne National Laboratory, Argonne, IL
V. Yefremenko
Materials Science Division, Argonne National Laboratory, Argonne, IL
A.M. Cucolo
E.R. Caianiello Physics Department, University of Salerno, IT
