Asymmetric crossing of the attractive and repulsive magnetic potential by Abrikosov vortices

Vlasko-Vlasov, V. K.; Glatz, A.; Rosenmann, D.; Divan, R.; Kwok, W. -K.

doi:10.1103/physrevb.102.174511

Asymmetric crossing of the attractive and repulsive magnetic potential by Abrikosov vortices

Journal Article · Mon Nov 30 00:00:00 EST 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.102.174511· OSTI ID:1762153

Vlasko-Vlasov, V. K. ^[1]; Glatz, A. ^[2]; Rosenmann, D. ^[1]; Divan, R. ^[1]; Kwok, W. -K. ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Northern Illinois Univ., DeKalb, IL (United States)

Here, we present studies of Abrikosov vortex motion across the magnetically charged edges of long thin ferromagnetic stripes placed above or under a thin superconducting film. The magnetic charges at the stripe edges form attractive or repulsive potential wells for vortices. Using a relatively small in-plane magnetic field to polarize the stripe edges and normal-to-plane magnetic field to induce up or down polarized vortices, we tune the attractive or repulsive stripe-vortex interactions. Imaging of the vortex dynamics reveals that the repulsive magnetic potential U_m⁺ acts as a robust vortex pinning barrier, while the attractive U_m^- has practically no effect on the vortex motion irrespective of the position of the stripes located above or underneath the superconducting film. We analyze the observed asymmetry using equations of the overdamped vortex motion. The formal analytical solution yields an asymmetry, but the numerical modeling with and without noise terms does not confirm it. Instead, we find that the asymmetry is caused by the creation of spontaneous vortices at the maxima of U_m, which depends on the edge polarity and suppress U_m^- . Furthermore, our experiment and time-dependent Ginzburg-Landau simulations demonstrate that magnetic pinning dominates over vortex pinning due to corrugations of the superconducting layer deposited on top of the ferromagnetic stripes.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1762153

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 17 Vol. 102; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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