We report transport measurements in a superconducting Co/Nb/Co trilayer based on elemental ferromagnetic
Co and elemental superconducting Nb. The trilayer behaves as a superconducting valve, can be operated at
liquid-helium temperature, and can switch from superconductive to normal state in weak applied in-plane
magnetic fields. Current-voltage curves, critical currents as a function of temperature and magnetic field, as
well as preparation of superconductive or resistive state are addressed here. Data analysis suggests that the
superconducting valve behavior can be accounted for by a glassy vortex phase induced in the superconductor
by the stray fields from domain walls proliferating around the coercive fields of the ferromagnetic electrodes
Magnetic nano drug targeting, through the use of an external magnetic field, is a new technique for the treatment of several diseases, which can potentially avoid the dispersion of drugs in undesired locations of the body. Nevertheless, due to the limitations on the intensity of the magnetic field applied, the hydrodynamic forces can reduce the effectiveness of the procedure. This technique is studied in this paper with the Computational Fluid Dynamics (CFD), focusing on the influence of the magnetic probe position, and the direction of the circulating electric current. A single rectangular coil is used to generate the external magnetic field. A patient-specific geometry of the coeliac trunk is reconstructed from DICOM images, with the use of VMTK. A new solver, coupling the Lagrangian dynamics of the nanoparticles with the Eulerian dynamics of the blood, is implemented in OpenFOAM to perform the simulations. The resistive pressure, the Womersley's profile for the inlet velocity and the magnetic field of a rectangular coil are implemented in the software as boundary conditions. The results show the influence of the position of the probe, as well as the limitations associated with the rectangular coil configuration.
We report magnetotransport measurements on Py/Nb bilayers patterned in a Hall strip geometry, with Permalloy allowing a weak stripe domain regime. After application of a weak magnetic field in the plane of the bilayer perpendicular to the transport current, the strip behaves as a bistable superconducting diode and a nonvolatile superconducting valve as well. The observed behavior can be accounted for by the stray fields at the edges of the strip that modulate the distribution of the stray fields from the stripe domains in the ferromagnetic layer, generating an asymmetric and bistable magnetic forces background for the Abrikosov vortices moving in the superconducting layer.
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