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

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.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1357459
DOE Contract Number:
AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 4th International Conference on Superconductivity and Magnetism, 04/27/14 - 05/02/14, Antalya , TUR
Country of Publication:
United States
Language:
English
Subject:
Low Temperature Superconductors; Superonductor - Ferromagnet Hybrids; Vortices and Nanostructured Superconductors

Citation Formats

Iavarone, M., Moore, S. A., Fedor, J., Novosad, V., Pearson, J. E., and Karapetrov, G. Influence of Domain Width on Vortex Nucleation in Superconductor/Ferromagnet Hybrid Structures.. United States: N. p., 2015. Web. doi:10.1007/s10948-014-2650-9.
Iavarone, M., Moore, S. A., Fedor, J., Novosad, V., Pearson, J. E., & Karapetrov, G. Influence of Domain Width on Vortex Nucleation in Superconductor/Ferromagnet Hybrid Structures.. United States. doi:10.1007/s10948-014-2650-9.
Iavarone, M., Moore, S. A., Fedor, J., Novosad, V., Pearson, J. E., and Karapetrov, G. Sun . "Influence of Domain Width on Vortex Nucleation in Superconductor/Ferromagnet Hybrid Structures.". United States. doi:10.1007/s10948-014-2650-9. https://www.osti.gov/servlets/purl/1357459.
@article{osti_1357459,
title = {Influence of Domain Width on Vortex Nucleation in Superconductor/Ferromagnet Hybrid Structures.},
author = {Iavarone, M. and Moore, S. A. and Fedor, J. and Novosad, V. and Pearson, J. E. and Karapetrov, G.},
abstractNote = {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.},
doi = {10.1007/s10948-014-2650-9},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Mar 15 00:00:00 EDT 2015},
month = {Sun Mar 15 00:00:00 EDT 2015}
}

Conference:
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