High-resolution scanning hall probe microscopy

ORAL

Abstract

Scanning hall sensors can be used to directly image magnetic fields at surfaces. They offer high resolution, high sensitivity, operability from cryogenic to room temperature, and linearity. We have fabricated hall sensors on GaAs / Al$_{0.35}$Ga$_{0.65}$As and GaAs / Al$_{0.3}$Ga$_{0.7}$As heterostructures, one containing a 2D electron gas 40 nanometers below the surface and another 140nm below the surface, as well as an In$_{0.5}$Al$_{0.5}$As / GaSb / AlSb / InAs heterostructure containing a 2DEG 21nm below the surface. The sensitive areas of our probes range from microns to 60nm on a side. We report on the field sensitivities of the probes and their spatial resolution in a scanning configuration.

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Authors

  • Hendrik Bluhm

  • C.W. Hicks

  • M.A. Topinka

  • K.A. Moler

    Geballe Laboratory for Advanced Materials, Stanford University, Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford University, Department of Applied Physics and Gebelle Laboratory for Advanced Materials, Stanford University

  • J.W. Guikema

    Laboratory of Atomic and Solid State Physics, Cornell University

  • Eli Zeldov

    Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel

  • H. Shtrikman

    Weizmann Institute of Science, Department of Condensed Matter Physics, Weizmann Institute of Science, Weizmann Institute