Extreme magnetic anisotropy and multiple superconducting transition signatures in a [Nb(23 nm)/Ni(5 nm)]5 multilayer

L. E. De Long; S. A. Kryukov; Amish G. Joshi; Wentao Xu; A. Bosomtwi; B. J. Kirby; M. R. Fitzsimmons

doi:10.1016/j.physc.2007.11.073

Extreme magnetic anisotropy and multiple superconducting transition signatures in a [Nb(23 nm)/Ni(5 nm)]₅ multilayer

L. E. De Long, S. A. Kryukov, Amish G. Joshi, Wentao Xu, A. Bosomtwi, B. J. Kirby, M. R. Fitzsimmons

Physics And Astronomy

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We have applied polarized neutron reflectometry, and novel SQUID and vibrating reed magnetometry to probe a [Nb(23 nm)/Ni(5 nm)]₅ multilayer (ML) whose superconducting state magnetic anisotropy is dominated by confined (in-plane) supercurrents in DC magnetic fields, H, applied nearly parallel to the ML plane. The upper critical field exhibits abrupt shifts (0.1-0.6 K) in near-parallel fields, but is field-independent for μ₀H < 0.8 T when the ML is exactly aligned with the DC field, indicating suppression of orbital pairbreaking and the possible presence of unconventional superconducting pairing states.

Original language	English
Pages (from-to)	523-530
Number of pages	8
Journal	Physica C: Superconductivity and its Applications
Volume	468
Issue number	7-10
DOIs	https://doi.org/10.1016/j.physc.2007.11.073
State	Published - Apr 1 2008

Bibliographical note

Funding Information:
Research at the University of Kentucky was supported by U.S. DoE Grant #DE-FG02-97ER45653 and Kentucky Science and Engineering Foundation Grant #KSEF-148-502-03-49. A.G.J. was supported as a BOYSCAST Fellow of Indian Ministry of Science and Technology, Grant No. SR/BY/P-01/04. Prof. Jose L. Vicent of the Universidad Complutense, Madrid, contributed Nb/Ni ML for this work.

Funding

Research at the University of Kentucky was supported by U.S. DoE Grant #DE-FG02-97ER45653 and Kentucky Science and Engineering Foundation Grant #KSEF-148-502-03-49. A.G.J. was supported as a BOYSCAST Fellow of Indian Ministry of Science and Technology, Grant No. SR/BY/P-01/04. Prof. Jose L. Vicent of the Universidad Complutense, Madrid, contributed Nb/Ni ML for this work.

Funders	Funder number
Michigan State University-U.S. Department of Energy (MSU-DOE) Plant Research Laboratory	FG02-97ER45653
Kentucky Science and Engineering Foundation	-148-502-03-49

Keywords

Magnetic multilayers
Mesoscopic superconductors
Neutron reflectometry
Superconducting critical field
Superconducting multilayers
Superconducting phase diagrams

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2007.11.073

Cite this

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title = "Extreme magnetic anisotropy and multiple superconducting transition signatures in a [Nb(23 nm)/Ni(5 nm)]5 multilayer",

abstract = "We have applied polarized neutron reflectometry, and novel SQUID and vibrating reed magnetometry to probe a [Nb(23 nm)/Ni(5 nm)]5 multilayer (ML) whose superconducting state magnetic anisotropy is dominated by confined (in-plane) supercurrents in DC magnetic fields, H, applied nearly parallel to the ML plane. The upper critical field exhibits abrupt shifts (0.1-0.6 K) in near-parallel fields, but is field-independent for μ0H < 0.8 T when the ML is exactly aligned with the DC field, indicating suppression of orbital pairbreaking and the possible presence of unconventional superconducting pairing states.",

keywords = "Magnetic multilayers, Mesoscopic superconductors, Neutron reflectometry, Superconducting critical field, Superconducting multilayers, Superconducting phase diagrams",

author = "\{De Long\}, \{L. E.\} and Kryukov, \{S. A.\} and Joshi, \{Amish G.\} and Wentao Xu and A. Bosomtwi and Kirby, \{B. J.\} and Fitzsimmons, \{M. R.\}",

note = "Funding Information: Research at the University of Kentucky was supported by U.S. DoE Grant \#DE-FG02-97ER45653 and Kentucky Science and Engineering Foundation Grant \#KSEF-148-502-03-49. A.G.J. was supported as a BOYSCAST Fellow of Indian Ministry of Science and Technology, Grant No. SR/BY/P-01/04. Prof. Jose L. Vicent of the Universidad Complutense, Madrid, contributed Nb/Ni ML for this work. ",

year = "2008",

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doi = "10.1016/j.physc.2007.11.073",

language = "English",

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T1 - Extreme magnetic anisotropy and multiple superconducting transition signatures in a [Nb(23 nm)/Ni(5 nm)]5 multilayer

AU - De Long, L. E.

AU - Kryukov, S. A.

AU - Joshi, Amish G.

AU - Xu, Wentao

AU - Bosomtwi, A.

AU - Kirby, B. J.

AU - Fitzsimmons, M. R.

N1 - Funding Information: Research at the University of Kentucky was supported by U.S. DoE Grant #DE-FG02-97ER45653 and Kentucky Science and Engineering Foundation Grant #KSEF-148-502-03-49. A.G.J. was supported as a BOYSCAST Fellow of Indian Ministry of Science and Technology, Grant No. SR/BY/P-01/04. Prof. Jose L. Vicent of the Universidad Complutense, Madrid, contributed Nb/Ni ML for this work.

PY - 2008/4/1

Y1 - 2008/4/1

N2 - We have applied polarized neutron reflectometry, and novel SQUID and vibrating reed magnetometry to probe a [Nb(23 nm)/Ni(5 nm)]5 multilayer (ML) whose superconducting state magnetic anisotropy is dominated by confined (in-plane) supercurrents in DC magnetic fields, H, applied nearly parallel to the ML plane. The upper critical field exhibits abrupt shifts (0.1-0.6 K) in near-parallel fields, but is field-independent for μ0H < 0.8 T when the ML is exactly aligned with the DC field, indicating suppression of orbital pairbreaking and the possible presence of unconventional superconducting pairing states.

AB - We have applied polarized neutron reflectometry, and novel SQUID and vibrating reed magnetometry to probe a [Nb(23 nm)/Ni(5 nm)]5 multilayer (ML) whose superconducting state magnetic anisotropy is dominated by confined (in-plane) supercurrents in DC magnetic fields, H, applied nearly parallel to the ML plane. The upper critical field exhibits abrupt shifts (0.1-0.6 K) in near-parallel fields, but is field-independent for μ0H < 0.8 T when the ML is exactly aligned with the DC field, indicating suppression of orbital pairbreaking and the possible presence of unconventional superconducting pairing states.

KW - Magnetic multilayers

KW - Mesoscopic superconductors

KW - Neutron reflectometry

KW - Superconducting critical field

KW - Superconducting multilayers

KW - Superconducting phase diagrams

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