Vortex Pinning in Ferromagnet/Superconductor Bilayers — the Dependence on the Ferromagnetic Layer and Temperature
نویسنده
چکیده
The behavior of vortex pinning induced by the magnetic domain reversal is studied in the ferromagnet/superconductor bilayers in which superconducting film is niobium and the ferromagnetic layers are the Co/Pt superlattices with perpendicular magnetic anisotropy. The local magnetic field across narrow ferromagnet/superconductor bilayer stripe is measured using a line of miniature Hall sensors. The pinning is studied for samples with different amount of repeats of Co/Pt superlattice, and as a function of temperature.
منابع مشابه
Proximity Effects in Superconductor-ferromagnet Heterostructures
The very special characteristic of the proximity effect in superconductor-ferromagnet systems is the damped oscillatory behavior of the Cooper pair wave function in a ferromagnet. In some sense, this is analogous to the inhomogeneous superconductivity, predicted long time ago by Larkin and Ovchinnikov (1964), and Fulde and Ferrell (1964), and constantly searched since that. After the qualitativ...
متن کاملEnergy gap of ferromagnet-superconductor bilayers
The excitation spectrum of clean ferromagnet-superconductor bilayers is calculated within the framework of the self-consistent Bogoliubov-de Gennes theory. Because of the proximity effect, the superconductor induces a gap in the ferromagnet spectrum, for thin ferromagnetic layers. The effect depends strongly on the exchange field in the ferromagnet. We find that as the thickness of the ferromag...
متن کاملProximity effects in superconductor/insulating-ferromagnet NbN/GdN multilayers.
Proximity effects between superconducting and magnetic layers have been some of the most actively studied subjects in the past decades. It has been well established that magnetic moments and magnetic order are highly effective in destroying Cooper pairs and strongly depressing superconductivity. Thus in superconductor/ferromagnet (S/F) multilayers, one observes that the superconducting transiti...
متن کاملReconfigurable superconducting vortex pinning potential for magnetic disks in hybrid structures
High resolution scanning Hall probe microscopy has been used to directly visualise the superconducting vortex behavior in hybrid structures consisting of a square array of micrometer-sized Py ferromagnetic disks covered by a superconducting Nb thin film. At remanence the disks exist in almost fully flux-closed magnetic vortex states, but the observed cloverleaf-like stray fields indicate the pr...
متن کاملEffects of the sintering temperature on the flux-pinning mechanism and the activation energy of malic-acid doped MgB2
The flux-pinning mechanism and activation energy of 10 wt % malic acid-doped MgB2 were investigated by measuring of the critical current density and resistivity as a function of magnetic field and temperature. A crossover field, Bsb, was observed from the single vortex to the small vortex bundle pinning regime. For the sintered sample, the temperature dependence of Bsb(T) at low temperature i...
متن کامل