Temperature dependence and mechanisms for vortex pinning by periodic arrays of Ni dots in Nb films

Details Temperature dependence and mechanisms for vortex pinning by periodic arrays of Ni dots in Nb films Temperature dependence and mechanisms for vortex pinning by periodic arrays of Ni dots in Nb films

2000-09-18

arxiv.org/abs/cond-mat/0009257v1

Physics

Condensed Matter

Superconductivity

12 text pages (revtex), 6 figures (1st jpeg, 2nd-6th postscript) accepted in Physical Review B

Scientific paper

10.1103/PhysRevB.62.9110

Pinning interactions between superconducting vortices in Nb and magnetic Ni dots were studied as a function of current and temperature to clarify the nature of pinning mechanisms. A strong current dependence is found for a square array of dots, with a temperature dependent optimum current for the observation of periodic pinning, that decreases with temperature as (1-T/Tc)3/2. This same temperature dependence is found for the critical current at the first matching field with a rectangular array of dots. The analysis of these results allows to narrow the possible pinning mechanisms to a combination of two: the interaction between the vortex and the magnetic moment of the dot and the proximity effect. Moreover, for the rectangular dot array, the temperature dependence of the crossover between the low field regime with a rectangular vortex lattice to the high field regime with a square configuration has been studied. It is found that the crossover field increases with decreasing temperature. This dependence indicates a change in the balance between elastic and pinning energies, associated with dynamical effects of the vortex lattice in the high field range.

Affiliated with

Also associated with

No associations

Rating

Temperature dependence and mechanisms for vortex pinning by periodic arrays of Ni dots in Nb films does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Temperature dependence and mechanisms for vortex pinning by periodic arrays of Ni dots in Nb films, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temperature dependence and mechanisms for vortex pinning by periodic arrays of Ni dots in Nb films will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-126436