Superresolution magnetic imaging by a Josephson junction via holographic reconstruction of Ic(H) modulation

Razmik A. Hovhannisyan; Taras Golod; Vladimir M. Krasnov

doi:10.1103/PhysRevApplied.20.064012

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Superresolution magnetic imaging by a Josephson junction via holographic reconstruction of Ic(H) modulation

Razmik A. Hovhannisyan, Taras Golod, Vladimir M. Krasnov

DOI 10.1103/PhysRevApplied.20.064012 · Physical Review Applied

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Abstract

This work provides a proof-of-concept for superresolution magnetic imaging using a single Josephson junction. The technique resembles digital holography: magnetic patterns are obtained via an inverse-problem solution from diffractionlike modulation of the junction’s critical current, Ic(H). We demonstrate numerical reconstruction of complex two-dimensional patterns, verify the technique experimentally using Nb-based planar junctions, and fabricate an operational sensor on a cantilever. Our results show that Josephson holography allows for both high spatial resolution (approximately 20nm) and high field sensitivity (approximately 10−11T/Hz), thus resolving the trade-off problem between resolution and sensitivity in magnetic scanning probe imaging.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.6	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.24	Pressure not reported	unknown