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Journal of Superconductivity and Novel Magnetism

, Volume 28, Issue 3, pp 1107–1110 | Cite as

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

  • M. IavaroneEmail author
  • S. A. Moore
  • J. Fedor
  • V. Novosad
  • J. A. Pearson
  • G. Karapetrov
Original Paper

Abstract

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.

Keywords

Superconductor-ferromagnet hybrids Vortices and nanostructured superconductors Low-temperature superconductors 

Notes

Acknowledgments

Work at Temple University was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award DE-SC0004556. Work at Argonne was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) under Award No. DE-AC02-06CH11357.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • M. Iavarone
    • 1
    Email author
  • S. A. Moore
    • 1
  • J. Fedor
    • 1
    • 4
  • V. Novosad
    • 2
  • J. A. Pearson
    • 2
  • G. Karapetrov
    • 3
  1. 1.Physics DepartmentTemple UniversityPhiladelphiaUSA
  2. 2.Materials Science DivisionArgonne National LaboratoryArgonneUSA
  3. 3.Physics DepartmentDrexel UniversityPhiladelphiaUSA
  4. 4.Institute of Electrical EngineeringSlovak Academy of SciencesBratislavaSlovakia

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