Real-time scanning Hall probe microscopy

26 August 1996

journal article
Published by AIP Publishing in Applied Physics Letters

Vol. 69 (9) , 1324-1326
https://doi.org/10.1063/1.117582

Abstract

We describe a low‐noise scanning Hall probe microscope having unprecedented magnetic field sensitivity (∼2.9×10⁻⁸ T/√Hz at 77 K), high spatial resolution, (∼0.85 μm), and operating in real‐time (∼1 frame/s) for studying flux profiles at surfaces. A submicron Hall probe manufactured in a GaAs/AlGaAs two‐dimensional electron gas (2DEG) is scanned over the sample to measure the surface magnetic fields using conventional scanning tunneling microscopy positioning techniques. Flux penetration into a high T_c YBa₂Cu₃O_7−δ thin film has been observed in real time at 85 K with single vortex resolution. Flux is seen to enter the film in the form of vortex bundles as well as single flux quanta, Φ₀.

Keywords

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