On the Explanation of the Paramagnetic Meissner Effect in Superconductor/Ferromagnet Heterostructures

Abstract

An increase of the magnetic moment in superconductor/ferromagnet (S/F) bilayers V(40nm)/F [F$=$Fe(1,3nm), Co(3nm), Ni(3nm)] was observed using SQUID magnetometry upon cooling below the superconducting transition temperature Tc in magnetic fields of 10 Oe to 50 Oe applied parallel to the sample surface. A similar increase, often called the paramagnetic Meissner effect (PME), was observed before in various superconductors and superconductor/ferromagnet systems. To explain the PME effect in the presented S/F bilayers a model based on a row of vortices located at the S/F interface is proposed. According to the model the magnetic moment induced below Tc consists of the paramagnetic contribution of the vortex cores and the diamagnetic contribution of the vortex-free region of the S layer. Since the thickness of the S layer is found to be 3-4 times less than the magnetic field penetration depth, this latter diamagnetic contribution is negligible. The model correctly accounts for the sign, the approximate magnitude and the field dependence of the paramagnetic and the Meissner contributions of the induced magnetic moment upon passing the superconducting transition of a ferromagnet/superconductor bilayer.

References in corpus (11)

• Nonmonotonic critical temperature in superconductor/ferromagnet bilayers
• Magnetic proximity effect in $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_7/L{\mathbf{a}}_{2/3}\mathbf{C}{\mathbf{a}}_{1/3}\mathbf{Mn}{\mathbf{O}}_3$ and $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_7/LaMn{\mathbf{O}}_{3+\delta }$ superlattices
• Paramagnetic Meissner effect and related dynamical phenomena
• Magnetic proximity effects in V/Fe superconductor/ferromagnet single bilayer revealed by waveguide-enhanced polarized neutron reflectometry
• On the feasibility to study inverse proximity effect in a single S/F bilayer by Polarized Neutron Reflectometry
• GINA - A Polarized Neutron Reflectometer at the Budapest Neutron Centre
• Magnetic State Modification Induced by Superconducting Response in Ferromagnet/Superconductor Hybrids
• Magnetic proximity effect at interface between a cuprate superconductor and an oxide spin valve
• Feasibility of study magnetic proximity effects in bilayer "superconductor/ferromagnet" using waveguide-enhanced Polarized Neutron Reflectometry
• Influence of the FFLO-like State on the Upper Critical Field of a S/F Bilayer: Angular and Temperature Dependence
• Direct observation of nanometer-scale pinning sites in (Nd${}_{0.33}$,Eu${}_{0.20}$,Gd${}_{0.47}$)Ba${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals

Cited by in corpus (8)

• Electromagnetic proximity effect in planar superconductor-ferromagnet structures
• Magnetic and Superconducting Phase Diagram of Nb/Gd/Nb trilayers
• Electromagnetic proximity effect controlled by spin-triplet correlations in superconducting spin-valve structures
• Inverse magnetic hysteresis of the Josephson supercurrent: study of the magnetic properties of thin niobium/permalloy (Fe_{20}Ni_{80}) interfaces
• Proximity effect in [Nb(1.5nm)/Fe(x)]${}_{10}$/Nb(50nm) superconducting/ferromagnet heterostructures
• Inverse Proximity Effects at Spin-Triplet Superconductor-Ferromagnet Interface
• Giant electromagnetic proximity effect in superconductor/ferromagnet superlattices
• Absence of magnetic interactions in Ni-Nb ferromagnet-superconductor bilayers