New geometries for high spatial resolution hall probes

Details New geometries for high spatial resolution hall probes New geometries for high spatial resolution hall probes

2002-10-23

arxiv.org/abs/cond-mat/0210517v1

Journal of Applied Physics 93, 2746 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 5 figures, submitted to Journal of Applied Physics

Scientific paper

10.1063/1.1543651

The Hall response function of symmetric and asymmetric planar Hall effect devices is investigated by scanning a magnetized tip above a sensor surface while simultaneously recording the topography and the Hall voltage. Hall sensor geometries are tailored using a Focused Ion Beam, in standard symmetric and new asymmetric geometries. With this technique we are able to reduce a single voltage probe to a narrow constriction 20 times smaller than the other device dimensions. We show that the response function is peaked above the constriction, in agreement with numerical simulations. The results suggest a new way to pattern Hall sensors for enhanced spatial resolution.

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