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We propose a novel type of magnetic scanning probe sensor, based on a singleplanar Josephson junction with a magnetic barrier. The planar geometry togetherwith high magnetic permeability of the barrier helps to focus flux in thejunction and thus enhance the sensitivity of the sensor. As a result, it mayoutperform equally sized SQUID both in terms of the magnetic field sensitivityand the spatial resolution in one scanning direction. We fabricate and analyzeexperimentally sensor prototypes with a superparamagnetic CuNi and aferromagnetic Ni barrier. We demonstrate that the planar geometry allows easyminiaturization to nm-scale, facilitates an effective utilization of theself-field phenomenon for amplification of sensitivity and a simpleimplementation of a control line for feed-back operation in a broad dynamicrange.

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