Magnetic flux patterns in superconductors deposited on a lattice of magnetic dots: A magneto-optical imaging study

Diana G. Gheorghe; Rinke J. Wijngaarden; Werner Gillijns; Alejandro V. Silhanek; Victor V. Moshchalkov

doi:10.1103/PhysRevB.77.054502

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Magnetic flux patterns in superconductors deposited on a lattice of magnetic dots: A magneto-optical imaging study

Diana G. Gheorghe, Rinke J. Wijngaarden, Werner Gillijns, Alejandro V. Silhanek, Victor V. Moshchalkov

DOI 10.1103/PhysRevB.77.054502 · Physical Review B

T1

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Abstract

We investigate the flux penetration in Pb films, of different shapes, deposited on top of a periodic array of Co∕Pt dots with perpendicular anisotropy by means of magnetization and magneto-optical measurements. A clear dependence of the critical current density on the magnetic state of the dots and their polarity with respect to the direction of the applied magnetic field is observed by both techniques. The magnetic state of the dots changes the flux penetration from smooth to channelling. Additionally, in the fully magnetized state, an anisotropic current distribution is observed in circular-shaped samples. The flux penetration is dominated by avalanches only for configurations which correspond to a high critical current, irrespective of its origin, be it low temperature, magnetization state of the dots, or angle between the lattice of dots and the edge of the sample.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	unknown