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Method for the detection of a magnetic field utilizing a magnetic vortex

United States Patent

April 13, 2010
View the Complete Patent at the US Patent & Trademark Office
Argonne National Laboratory - Visit the Technology Development and Commercialization Website
The determination of the strength of an in-plane magnetic field utilizing one or more magnetically-soft, ferromagnetic member, having a shape, size and material whereas a single magnetic vortex is formed at remanence in each ferromagnetic member. The preferred shape is a thin circle, or dot. Multiple ferromagnetic members can also be stacked on-top of each other and separated by a non-magnetic spacer. The resulting sensor is hysteresis free. The sensor's sensitivity, and magnetic saturation characteristics may be easily tuned by simply altering the material, size, shape, or a combination thereof to match the desired sensitivity and saturation characteristics. The sensor is self-resetting at remanence and therefore does not require any pinning techniques.
Novosad; Valentyn (Chicago, IL), Buchanan; Kristen (Batavia, IL)
The United States of America as represented by the United States Department of Energy (Washington, DC), N/A (
11/ 530,148
September 8, 2006
GOVERNMENT INTERESTS The United States Government has rights in this invention pursuant to Contract No. W-31-109-ENG-38, between the U.S. Department of Energy (DOE) and the University of Chicago.