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 over a broad temperature range, 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 containing 2D electron gases 40, 39 and 140nm beneath the surface. The sensitive areas of our probes range from microns to 85nm on a side. We report on the field sensitivities of probes of various sizes and their spatial resolution in a scanning configuration.

*supported by the NSC Center for Probing the Nanoscale

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Authors

  • Clifford Hicks

  • Lan Luan

  • Hendrik Bluhm

  • Kathryn A. Moler

    • Stanford University
    • Geballe Laboratory for Advanced Materials, Stanford University

  • Janice Guikema

    • Laboratory of Atomic and Solid State Physics, Cornell University

  • Eli Zeldov

  • Hadas Shtrikman

    • Department of Condensed Matter Physics, Weizmann Institute of Science