Giant oscillatory Gilbert damping in superconductor/ferromagnet/superconductor junctions

Yao, Yuan; Cai, Ranran; Yu, Tao; Ma, Yang; Xing, Wenyu; Ji, Yuan; Xie, X. C.; Yang, See‐Hun; Han, Wei

doi:10.1126/sciadv.abh3686

Cited by 12 publications

(8 citation statements)

References 61 publications

(101 reference statements)

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“…Besides the DC Josephson coupling effect, the dynamic spin properties of 0-π FM Josephson junctions have been recently investigated by Yao et al [91] via FMR method.…”

Section: -𝛑 Transition In Fm Josephson Junctionmentioning

confidence: 99%

“…To directly recognize 0-𝜋 ground states, phase-sensitive measurements have been c) Reproduced with permission. [91] Copyright 2021, American Association for the Advancement of Science. b) Reproduced with permission.…”

Section: -𝝅 Transition In Ferromagnet Josephson Junctionmentioning

confidence: 99%

“…Besides the DC Josephson coupling effect, the dynamic spin properties of 0-𝜋 FM Josephson junctions have been recently investigated by Yao et al [91] via FMR method. As shown in the Figure 5c, the Gilbert damping in the Nb/Py/Nb heterostructures reveals a giant oscillatory behavior as a function of the Py thickness.…”

Section: -𝝅 Transition In Ferromagnet Josephson Junctionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Superconductor/Ferromagnet Heterostructures: A Platform for Superconducting Spintronics and Quantum Computation

2022

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The interplay between superconductivity and ferromagnetism in the superconductor/ferromagnet (SC/FM) heterostructures generates many interesting physical phenomena, including spin-triplet superconductivity, superconducting order parameter oscillation, and topological superconductivity. The unique physical properties make the SC/FM heterostructures as promising platforms for future superconducting spintronics and quantum computation applications. In this article, we review important research progress of SC/FM heterostructures from superconducting spintronics to quantum computation, and it is organized as follows. Firstly, we discuss the progress of spin current carriers in SC/FM heterostructures including Bogoliubov quasiparticles, superconducting vortex, and spin-triplet Cooper pairs which might be used for long-range spin transport. Then, we will describe the π Josephson junctions and its application for constructing π qubits. Finally, we will briefly review experimental signatures of Majorana states in the SC/FM heterostructures and the theoretically proposed manipulation, which could be useful to realize fault-tolerant topological quantum computing.

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“…Besides the DC Josephson coupling effect, the dynamic spin properties of 0-π FM Josephson junctions have been recently investigated by Yao et al [91] via FMR method.…”

Section: -𝛑 Transition In Fm Josephson Junctionmentioning

confidence: 99%

Section: -𝝅 Transition In Ferromagnet Josephson Junctionmentioning

confidence: 99%

Section: -𝝅 Transition In Ferromagnet Josephson Junctionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Superconductor/Ferromagnet Heterostructures: A Platform for Superconducting Spintronics and Quantum Computation

2022

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Superconducting tunnel junctions with layered superconductors

Bi,

Chen,

et al. 2024

Quantum Front

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The superconducting tunneling effect in heterostructures, describing the process where single electrons or Cooper pairs tunnel through the barrier, can always play a significant role in understanding the phase coherence and pairing mechanisms in superconductors. Taking advantage of the easy cleavage to atomically-thin monolayer structure of layered superconductors and resulting quantum confinement of electrons or Cooper pairs at two-dimensional limit, van der Waals superconducting materials hosting superconducting order in monolayers or heterostructures can exhibit extensive emergent phenomena associated with quantum phase transitions of vortex and anti-vortex pairs. Examples of superconducting tunnel junctions (STJs) based on layered superconductors have been demonstrated to achieve novel phenomena, including Andreev bound states, Majorana bound states and 0/π-phase junctions. Since the characteristic parameters of quasiparticle tunneling through the barrier are directly associated with the energy gap values of superconductors, such critical parameter can be obtained within the STJ device geometry, which helps us understand and control the pairing states and emerging phenomena in superconductors. In this review, from the perspective of STJs with single electron tunneling and Cooper pair tunneling, we discuss Andreev reflection, Majorana bound states, photon-induced tunneling effects, non-reciprocal transport and superconducting diode phenomena, as well as prospects for layered-superconductor-based STJs.

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Direct observation of a superconducting vortex diode

et al. 2023

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The interplay between magnetism and superconductivity can lead to unconventional proximity and Josephson effects. A related phenomenon that has recently attracted considerable attention is the superconducting diode effect, in which a nonreciprocal critical current emerges. Although superconducting diodes based on superconductor/ferromagnet (S/F) bilayers were demonstrated more than a decade ago, the precise underlying mechanism remains unclear. While not formally linked to this effect, the Fulde–Ferrell–Larkin–Ovchinikov (FFLO) state is a plausible mechanism due to the twofold rotational symmetry breaking caused by the finite center-of-mass-momentum of the Cooper pairs. Here, we directly observe asymmetric vortex dynamics that uncover the mechanism behind the superconducting vortex diode effect in Nb/EuS (S/F) bilayers. Based on our nanoscale SQUID-on-tip (SOT) microscope and supported by in-situ transport measurements, we propose a theoretical model that captures our key results. The key conclusion of our model is that screening currents induced by the stray fields from the F layer are responsible for the measured nonreciprocal critical current. Thus, we determine the origin of the vortex diode effect, which builds a foundation for new device concepts.

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Giant oscillatory Gilbert damping in superconductor/ferromagnet/superconductor junctions

Cited by 12 publications

References 61 publications

Superconductor/Ferromagnet Heterostructures: A Platform for Superconducting Spintronics and Quantum Computation

Superconductor/Ferromagnet Heterostructures: A Platform for Superconducting Spintronics and Quantum Computation

Superconducting tunnel junctions with layered superconductors

Direct observation of a superconducting vortex diode

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