Theory of a weak-link superconductor-ferromagnet Josephson structure. / Gelhausen, Jan; Eschrig, Matthias.

In: Physical Review B, Vol. 94, No. 10, 104502, 06.09.2016, p. 1-14.

Research output: Contribution to journalArticlepeer-review

Published

Standard

Theory of a weak-link superconductor-ferromagnet Josephson structure. / Gelhausen, Jan; Eschrig, Matthias.

In: Physical Review B, Vol. 94, No. 10, 104502, 06.09.2016, p. 1-14.

Research output: Contribution to journalArticlepeer-review

Harvard

APA

Vancouver

Author

Gelhausen, Jan ; Eschrig, Matthias. / Theory of a weak-link superconductor-ferromagnet Josephson structure. In: Physical Review B. 2016 ; Vol. 94, No. 10. pp. 1-14.

BibTeX

@article{21b0a38b48e947cf9bc2fa786072d154,
title = "Theory of a weak-link superconductor-ferromagnet Josephson structure",
abstract = "We propose a model for the theoretical description of a weak-link Josephson junction, in which the weak link is spin-polarized due to proximity to a ferromagnetic metal (S-(F|S)-S). Employing Usadel transport theory appropriate for diffusive systems, we show that the weak link is described within the framework of Andreev circuit theory by an effective self-energy resulting from the implementation of spin-dependent boundary conditions. This leads to a considerable simplification of the model, and allows for an efficient numerical treatment. As an application of our model, we show numerical calculations of important physical observables such as the local density of states, proximity-induced minigaps, spin-magnetization, and the phase and temperature-dependence of Josephson currents of the S-(F|S)-S system. We discuss multi-valued current-phase relationships at low temperatures as well as their crossover to sinusoidal form at high temperatures. Additionally, we numerically treat (S-F-S) systems that exhibit a magnetic domain wall in the F region and calculate the temperature- dependence of the critical currents. ",
author = "Jan Gelhausen and Matthias Eschrig",
year = "2016",
month = sep,
day = "6",
doi = "10.1103/PhysRevB.94.104502",
language = "English",
volume = "94",
pages = "1--14",
journal = "Physical Review B",
issn = "1098-0121",
publisher = "American Physical Society",
number = "10",

}

RIS

TY - JOUR

T1 - Theory of a weak-link superconductor-ferromagnet Josephson structure

AU - Gelhausen, Jan

AU - Eschrig, Matthias

PY - 2016/9/6

Y1 - 2016/9/6

N2 - We propose a model for the theoretical description of a weak-link Josephson junction, in which the weak link is spin-polarized due to proximity to a ferromagnetic metal (S-(F|S)-S). Employing Usadel transport theory appropriate for diffusive systems, we show that the weak link is described within the framework of Andreev circuit theory by an effective self-energy resulting from the implementation of spin-dependent boundary conditions. This leads to a considerable simplification of the model, and allows for an efficient numerical treatment. As an application of our model, we show numerical calculations of important physical observables such as the local density of states, proximity-induced minigaps, spin-magnetization, and the phase and temperature-dependence of Josephson currents of the S-(F|S)-S system. We discuss multi-valued current-phase relationships at low temperatures as well as their crossover to sinusoidal form at high temperatures. Additionally, we numerically treat (S-F-S) systems that exhibit a magnetic domain wall in the F region and calculate the temperature- dependence of the critical currents.

AB - We propose a model for the theoretical description of a weak-link Josephson junction, in which the weak link is spin-polarized due to proximity to a ferromagnetic metal (S-(F|S)-S). Employing Usadel transport theory appropriate for diffusive systems, we show that the weak link is described within the framework of Andreev circuit theory by an effective self-energy resulting from the implementation of spin-dependent boundary conditions. This leads to a considerable simplification of the model, and allows for an efficient numerical treatment. As an application of our model, we show numerical calculations of important physical observables such as the local density of states, proximity-induced minigaps, spin-magnetization, and the phase and temperature-dependence of Josephson currents of the S-(F|S)-S system. We discuss multi-valued current-phase relationships at low temperatures as well as their crossover to sinusoidal form at high temperatures. Additionally, we numerically treat (S-F-S) systems that exhibit a magnetic domain wall in the F region and calculate the temperature- dependence of the critical currents.

U2 - 10.1103/PhysRevB.94.104502

DO - 10.1103/PhysRevB.94.104502

M3 - Article

VL - 94

SP - 1

EP - 14

JO - Physical Review B

JF - Physical Review B

SN - 1098-0121

IS - 10

M1 - 104502

ER -