Different approaches to generate matching effects using arrays in contact with superconducting films
arXiv:1607.08411 · doi:10.1088/1361-6668/30/2/025014
Abstract
Superconducting films in contact with non-superconducting regular arrays can exhibit commensurability effects between the vortex lattice and the unit cell of the pinning array. These matching effects yield a slowdown of the vortex flow and the corresponding dissipation decrease. The superconducting samples are Nb films grown on Si substrates. We have studied these matching effects with the array on top, embedded or threading the Nb superconducting films and using different materials (Si, Cu, Ni, Py dots and dots fabricated with Co/Pd multilayers). These hybrids allow studying the contribution of different pinning potentials to the matching effects. The main findings are: i) Periodic roughness induced in the superconducting film is enough to generate resistivity minima; ii) A minor effect is achieved by magnetic pinning from periodic magnetic field potentials obtained by dots with out of plane magnetization grown on top of the superconducting film, iii) In the case of array of magnetic dots embedded in the films vortex flow probes the magnetic state; i.e. magnetoresistance measurements detect the magnetic state of very small nanomagnets. In addition, we have studied the role played by the local order in the commensurability effects. This was attained using an array that mimics a smectic crystal. We have found that preserving the local order is crucial. If the local order is not retained the magnetoresistance minima vanish.
arXiv comment11 pages, 7 figures
References in corpus (20)
- Moving glass phase of driven lattices
- Hybrid superconducting-magnetic memory device using competing order parameters
- Nanoengineered magnetic-field-induced superconductivity
- Nucleation of superconductivity and vortex matter in superconductor - ferromagnet hybrids
- Dipole-induced vortex ratchets in superconducting films with arrays of micromagnets
- Guiding superconducting vortices by magnetic domain walls
- Strongly Enhanced Vortex Pinning by Conformal Crystal Arrays
- Temperature dependence and mechanisms for vortex pinning by periodic arrays of Ni dots in Nb films
- Enhancing the Critical Current of a Superconducting Film in a Wide Range of Magnetic Fields with a Conformal Array of Nanoscale Holes
- Enhancement of pinning properties of superconducting thin films by graded pinning landscapes
- Improving the performance of superconducting microwave resonators in magnetic fields
- Magnetic flux pinning in superconductors with hyperbolic-tesselation arrays of pinning sites
- Highly Effective Superconducting Vortex Pinning in Conformal Crystals
- Order in driven vortex lattices in superconducting Nb films with nanostructured pinning potentials
- Vortex ratchet reversal at fractional matching fields in kagomé-like array with symmetric pinning centers
- Magnetic dipole induced guided vortex motion
- Control of dissipation in superconducting films by magnetic stray fields
- Superconducting/magnetic three state nanodevice for memory and reading applications
- Rocking ratchet induced by pure magnetic potentials with broken reflection symmetry
- Experimental realization of smectic phase in vortex matter induced by symmetric potentials arranged in two-fold symmetry arrays