Non-collective Josephson-Vortex Motion Induced by Pancake-Vortex Pinning in Stacked Josephson Junctions

Jin, Yong-Duk; Lee, Gil‐Ho; Lee, Hu-Jong

doi:10.1007/s10948-010-0739-3

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…The pinning can be created by structural defects, which change the Josephson tunneling distance locally [12], or, alternatively, by forming pancake vortices at inclined magnetic fields [28]. The latter serves as magnetic pinning centers [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Effect of ordered array of magnetic dots on the dynamics of Josephson vortices in stacked SNS Josephson junctions under DC and AC current

et al. 2015

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Abstract.We use the anisotropic time-dependent Ginzburg-Landau theory to investigate the effect of a square array of out-of-plane magnetic dots on the dynamics of Josephson vortices (fluxons) in artificial stacks of superconducting-normal-superconducting (SNS) Josephson junctions in the presence of external DC and AC currents. Periodic pinning due to the magnetic dots distorts the triangular lattice of fluxons and results in the appearance of commensurability features in the current-voltage characteristics of the system. For the larger values of the magnetization, additional peaks appear in the voltage-time characteristics of the system due to the creation and annihilation of vortex-antivortex pairs. Peculiar changes in the response of the system to the applied current is found resulting in a "superradiant" vortex-flow state at large current values, where a rectangular lattice of moving vortices is formed. Synchronizing the motion of fluxons by adding a small ac component to the biasing dc current is realized. However, we found that synchronization becomes difficult for large magnetization of the dots due to the formation of vortex-antivortex pairs.

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Section: Introductionmentioning

confidence: 99%

Effect of ordered array of magnetic dots on the dynamics of Josephson vortices in stacked SNS Josephson junctions under DC and AC current

et al. 2015

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“…by structural defects which change the local Josephson tunneling distance. Pancake vortices, which appear at inclined magnetic fields [27], can also serve as magnetic pinning centers, affecting the in-plane motion of Josephson vortices [28,29]. Here, we study the effect of a square array of antidots (holes) on the dynamics of Josephson vortices in artificial stacks of superconducting-normal-superconducting (SNS) JJs.…”

Section: Introductionmentioning

confidence: 99%

In-phase motion of Josephson vortices in stacked SNS Josephson junctions: effect of ordered pinning

Berdiyorov¹,

Savel’ev²,

Kusmartsev³

et al. 2013

Supercond. Sci. Technol.

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The dynamics of Josephson vortices (fluxons) in artificial stacks of superconductingnormal-superconducting Josephson junctions is investigated using the anisotropic time-dependent Ginzburg-Landau theory in the presence of a square/rectangular array of pinning centers (holes). For small values of the applied drive, fluxons in different junctions move out of phase, forming a periodic triangular lattice. A rectangular lattice of moving fluxons is observed at larger currents, which is in agreement with previous theoretical predictions (Koshelev and Aranson 2000 Phys. Rev. Lett. 85 3938). This 'superradiant' flux-flow state is found to be stable in a wide region of applied current. The stability range of this ordered state is considerably larger than the one obtained for the pinning-free sample. Clear commensurability features are observed in the current-voltage characteristics of the system with pronounced peaks in the critical current at (fractional) matching fields. The effect of density and strength of the pinning centers on the stability of the rectangular fluxon lattice is discussed. Predicted synchronized motion of fluxons in the presence of ordered pinning can be detected experimentally using the rf response of the system, where enhancement of the Shapiro-like steps is expected due to the synchronization.

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Non-collective Josephson-Vortex Motion Induced by Pancake-Vortex Pinning in Stacked Josephson Junctions

Cited by 2 publications

References 16 publications

Effect of ordered array of magnetic dots on the dynamics of Josephson vortices in stacked SNS Josephson junctions under DC and AC current

Effect of ordered array of magnetic dots on the dynamics of Josephson vortices in stacked SNS Josephson junctions under DC and AC current

In-phase motion of Josephson vortices in stacked SNS Josephson junctions: effect of ordered pinning

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