Vortex-antivortex coexistence in Nb-based superconductor/ferromagnet heterostructures

Bobba, F.; Di Giorgio, C.; Scarfato, A.; Longobardi, M.; Iavarone, M.; Moore, S. A.; Karapetrov, G.; Novosad, V.; Yefremenko, V.; Cucolo, A. M.

doi:10.1103/PhysRevB.89.214502

Vortex-antivortex coexistence in Nb-based superconductor/ferromagnet heterostructures

Journal Article · Sun Jun 01 04:00:00 EDT 2014 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.89.214502· OSTI ID:1356627

Bobba, F.; Di Giorgio, C.; Scarfato, A.; Longobardi, M.; Iavarone, M.; Moore, S. A.; Karapetrov, G.; Novosad, V.; Yefremenko, V.; Cucolo, A. M.

Low-temperature magnetic force microscopy was used to study the threshold of nucleation of spontaneous vortex-antivortex structures in superconductor/ferromagnet (S/F) hybrid systems. We investigated S/F heterostructures composed of Py as the magnetic material and Nb as the superconductor, with different thicknesses of Py and Nb. The condition for nucleation of spontaneous vortex-antivortex structures depends on fundamental parameters such as the superconducting penetration depth and the coherence length, as well as on the thickness of the superconducting film and the magnetic domain width. We compare our experimental results with those of existing theoretical models and provide an estimate of the threshold of the local out-of-plane component of the magnetization for different Py film thicknesses.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1356627

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 21 Vol. 89; ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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