Unanticipated proximity behavior in ferromagnet-superconductor heterostructures with controlled magnetic noncollinearity

L. Y. Zhu; Yaohua Liu; F. S. Bergeret; J. E. Pearson; S. G.E. Te Velthuis; S. D. Bader; J. S. Jiang

doi:10.1103/PhysRevLett.110.177001

Unanticipated proximity behavior in ferromagnet-superconductor heterostructures with controlled magnetic noncollinearity

L. Y. Zhu, Yaohua Liu, F. S. Bergeret, J. E. Pearson, S. G.E. Te Velthuis, S. D. Bader, J. S. Jiang

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

22 Scopus citations

Abstract

Magnetization noncollinearity in ferromagnet-superconductor (F/S) heterostructures is expected to enhance the superconducting transition temperature (T_c) according to the domain-wall superconductivity theory, or to suppress T_c when spin-triplet Cooper pairs are explicitly considered. We study the proximity effect in F/S structures where the F layer is a Sm-Co/Py exchange-spring bilayer and the S layer is Nb. The exchange-spring contains a single, controllable and quantifiable domain wall in the Py layer. We observe an enhancement of superconductivity that is nonmonotonic as the Py domain wall is increasingly twisted via rotating a magnetic field, different from theoretical predictions. We have excluded magnetic fields and vortex motion as the source of the nonmonotonic behavior. This unanticipated proximity behavior suggests that new physics is yet to be captured in the theoretical treatments of F/S systems containing noncollinear magnetization.

Original language	English
Article number	177001
Journal	Physical Review Letters
Volume	110
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.110.177001
State	Published - Apr 24 2013
Externally published	Yes

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title = "Unanticipated proximity behavior in ferromagnet-superconductor heterostructures with controlled magnetic noncollinearity",

abstract = "Magnetization noncollinearity in ferromagnet-superconductor (F/S) heterostructures is expected to enhance the superconducting transition temperature (Tc) according to the domain-wall superconductivity theory, or to suppress Tc when spin-triplet Cooper pairs are explicitly considered. We study the proximity effect in F/S structures where the F layer is a Sm-Co/Py exchange-spring bilayer and the S layer is Nb. The exchange-spring contains a single, controllable and quantifiable domain wall in the Py layer. We observe an enhancement of superconductivity that is nonmonotonic as the Py domain wall is increasingly twisted via rotating a magnetic field, different from theoretical predictions. We have excluded magnetic fields and vortex motion as the source of the nonmonotonic behavior. This unanticipated proximity behavior suggests that new physics is yet to be captured in the theoretical treatments of F/S systems containing noncollinear magnetization.",

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AU - Zhu, L. Y.

AU - Liu, Yaohua

AU - Bergeret, F. S.

AU - Pearson, J. E.

AU - Te Velthuis, S. G.E.

AU - Bader, S. D.

AU - Jiang, J. S.

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AB - Magnetization noncollinearity in ferromagnet-superconductor (F/S) heterostructures is expected to enhance the superconducting transition temperature (Tc) according to the domain-wall superconductivity theory, or to suppress Tc when spin-triplet Cooper pairs are explicitly considered. We study the proximity effect in F/S structures where the F layer is a Sm-Co/Py exchange-spring bilayer and the S layer is Nb. The exchange-spring contains a single, controllable and quantifiable domain wall in the Py layer. We observe an enhancement of superconductivity that is nonmonotonic as the Py domain wall is increasingly twisted via rotating a magnetic field, different from theoretical predictions. We have excluded magnetic fields and vortex motion as the source of the nonmonotonic behavior. This unanticipated proximity behavior suggests that new physics is yet to be captured in the theoretical treatments of F/S systems containing noncollinear magnetization.

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Unanticipated proximity behavior in ferromagnet-superconductor heterostructures with controlled magnetic noncollinearity

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