Influence of Domain Width on Vortex Nucleation in Superconductor/Ferromagnet Hybrid Structures

Iavarone, Maria; Moore, S. A.; Fedor, J.; Novosad, V.; Pearson, J. A.; Karapetrov, G.

doi:10.1007/s10948-014-2650-9

Influence of Domain Width on Vortex Nucleation in Superconductor/Ferromagnet Hybrid Structures

Journal Article · Fri Aug 15 04:00:00 EDT 2014 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/s10948-014-2650-9· OSTI ID:1735522

^[1]; Moore, S. A. ^[2]; Fedor, J. ^[3]; Novosad, V. ^[4]; Pearson, J. A. ^[4]; Karapetrov, G. ^[5]

Temple Univ., Philadelphia, PA (United States); Temple University
Temple Univ., Philadelphia, PA (United States)
Temple Univ., Philadelphia, PA (United States); Slovak Academy of Sciences, Bratislava (Slovakia). Inst. of Electrical Engineering
Argonne National Lab. (ANL), Argonne, IL (United States)
Drexel Univ., Philadelphia, PA (United States)

In this paper, we have investigated the effect of spatially inhomogenous magnetic fields on vortex nucleation in magnetically coupled superconductor/ferromagnet hybrid structures. Using low-temperature scanning tunneling microscopy and spectroscopy (LT-STM/STS) we have studied Pb/[Co–Pd] systems with slightly inhomogeneous magnetic domain width throughout the sample. Visualization of the underlying magnetic template structure is achieved through field dependent conductance maps. In the case of zero applied fields, these maps reveal the absence of vortices below a threshold domain width. At those locations with insufficient domain width to support generation of vortices in zero applied fields, nucleation can be restored through the application of an external magnetic field, with vortices nucleating above the domain parallel to the external field. For the magnetic domain width studied in this work, local tunneling spectroscopy reveals uniform superconducting critical temperature as a function of location, despite of local differences in the stray field experienced by the superconductor.

Research Organization:: Temple Univ., Philadelphia, PA (United States)

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

Grant/Contract Number:: SC0004556; AC02-06CH11357

OSTI ID:: 1735522

Alternate ID(s):: OSTI ID: 1357459

Journal Information:: Journal of Superconductivity and Novel Magnetism, Journal Name: Journal of Superconductivity and Novel Magnetism Journal Issue: 3 Vol. 28; ISSN 1557-1939

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Influence of Domain Width on Vortex Nucleation in Superconductor/Ferromagnet Hybrid Structures

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