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Mehrnejat_2024_2D_Mater._11_021002.pdf (1.67 MB)

Flux-pinning mediated superconducting diode effect in NbSe2/CrGeTe3 heterostructure

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posted on 2024-05-14, 10:26 authored by A Mehrnejat, M Ciomaga Hatnean, MC Rosamond, N Banerjee, G Balakrishnan, Sergey SavelievSergey Saveliev, Fasil DejeneFasil Dejene

In ferromagnet/superconductor bilayer systems, dipolar fields from the ferromagnet can create asymmetric energy barriers for the formation and dynamics of vortices through flux pinning. Conversely, the flux emanating from vortices can pin the domain walls of the ferromagnet, thereby creating asymmetric critical currents. Here, we report the observation of a superconducting diode effect (SDE) in a NbSe2/CrGeTe3 van der Waals heterostructure in which the magnetic domains of CrGeTe3 control the Abrikosov vortex dynamics in NbSe2. In addition to extrinsic vortex pinning mechanisms at the edges of NbSe2, flux-pinning-induced bulk pinning of vortices can alter the critical current. This asymmetry can thus be explained by considering the combined effect of this bulk pinning mechanism along with the vortex tilting induced by the Lorentz force from the transport current in the NbSe2/CrGeTe3 heterostructure. We also provide evidence of critical current modulation by flux pinning depending on the history of the field setting procedure. Our results suggest a method of controlling the efficiency of the SDE in magnetically coupled van der Waals superconductors, where dipolar fields generated by the magnetic layer can be used to modulate the dynamics of the superconducting vortices in the superconductors.

Funding

Underpinning Multi-User Equipment

Engineering and Physical Sciences Research Council

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Henry Royce Institute for Advanced Materials Student Equipment Access Scheme

Sir Henry Royce InsStitute - recurrent grant

Engineering and Physical Sciences Research Council

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Single Crystal Growth at Warwick

Engineering and Physical Sciences Research Council

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Skyrmionics: From Magnetic Excitations to Functioning Low-Energy Devices

Engineering and Physical Sciences Research Council

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History

School

  • Science

Department

  • Physics

Published in

2D Materials

Volume

11

Issue

2

Publisher

IOP Publishing Ltd

Version

  • VoR (Version of Record)

Rights holder

© The Author(s)

Publisher statement

Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Acceptance date

2024-02-09

Publication date

2024-02-22

Copyright date

2024

ISSN

2053-1583

Language

  • en

Depositor

Dr Fasil Dejene. Deposit date: 7 May 2024

Article number

021002