Planar Superconductor-Ferromagnet-Superconductor Josephson junctions as scanning probe sensors

Abstract

We propose a novel type of magnetic scanning probe sensor, based on a single planar Josephson junction with a magnetic barrier. The planar geometry together with high magnetic permeability of the barrier helps to focus flux in the junction and thus enhance the sensitivity of the sensor. As a result, it may outperform equally sized SQUID both in terms of the magnetic field sensitivity and the spatial resolution in one scanning direction. We fabricate and analyze experimentally sensor prototypes with a superparamagnetic CuNi and a ferromagnetic Ni barrier. We demonstrate that the planar geometry allows easy miniaturization to nm-scale, facilitates an effective utilization of the self-field phenomenon for amplification of sensitivity and a simple implementation of a control line for feed-back operation in a broad dynamic range.

5 pages, 2 figures

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Cited by in corpus (15)

• Demonstration of a superconducting diode-with-memory, operational at zero magnetic field with switchable nonreciprocity
• Resistive state of SFS Josephson junctions in the presence of moving domain walls
• Josephson junctions in a local inhomogeneous magnetic field
• Mechanism of generation of a Josephson phase shift by an Abrikosov vortex
• Mesoscale phase separation of skyrmion-vortex matter in chiral magnet-superconductor heterostructures
• Nonlocal long-range synchronization of planar Josephson junction arrays
• Superconductivity assisted change of the perpendicular magnetic anisotropy in V/MgO/Fe junctions
• Observation of the dominant spin-triplet supercurrent in Josephson spin valves with strong Ni ferromagnets
• Beyond the effective length: How to analyze magnetic interference patterns of thin-film planar Josephson junctions with finite lateral dimensions
• YBa2Cu3O7/LaXMnO3 (X: Ca, Sr) based Superconductor/Ferromagnet/Superconductor junctions with memory functionality
• YBa${}_2$Cu${}_3$O${}_7$ Josephson diode operating as a high-efficiency ratchet
• Non-Hermitian superconducting diode effect
• Cascade switching current detectors based on arrays of Josephson junctions
• Holographic reconstruction of magnetic field distribution in a Josephson junction from diffraction-like Ic(H) patterns
• Planar Josephson junctions for sensors and electronics:Different geometry, new functionality