Magnetic Proximity-Induced Superconducting Diode Effect and Infinite Magnetoresistance in van der Waals Heterostructure

Abstract

We report unidirectional charge transport in a $\mathrm{NbS}{\mathrm{e}}_2$ noncentrosymmetric superconductor, which is exchange-coupled with a $\mathrm{CrP}{\mathrm{S}}_4$ van der Waals layered antiferromagnetic insulator. The $\mathrm{NbS}{\mathrm{e}}_2/CrP{\mathrm{S}}_4$ bilayer device exhibits bias-dependent superconducting critical-current variations of up to $16\%$, with the magnetochiral anisotropy reaching $\sim 10^5{\mathrm{T}}^{-1}{\mathrm{A}}^{-1}$. Furthermore, the $\mathrm{CrP}{\mathrm{S}}_4/NbS{\mathrm{e}}_2/CrP{\mathrm{S}}_4$ spin-valve structure exhibits the superconducting diode effect with critical-current variations of up to $40\%$. We also utilize the magnetic proximity effect to induce switching in the superconducting state of the spin-valve structure. It exhibits an infinite magnetoresistance ratio depending on the field sweep direction and magnetization configuration. Our result demonstrates a novel route for enhancing the nonreciprocal response in the weak external field regime ($<50\mathrm{mT}$) by exploiting the magnetic proximity effect.

25 pages, 3 figures, 2 supplemental figures

References in corpus (7)

• A Josephson junction supercurrent diode
• Intrinsic Superconducting Diode Effect
• Supercurrent diode effect and finite momentum superconductivity
• Supercurrent diode effect and magnetochiral anisotropy in few-layer NbSe${}_2$
• Superconducting diode effect via conformal-mapped nanoholes
• Revealing the magnetic proximity effect in EuS/Al bilayers through superconducting tunneling spectroscopy
• Spin-Resolved Tunneling Studies of the Exchange Field in EuS/Al Bilayers

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