Magnetic field angle sensor with GMR or MTJ elements

Details Magnetic field angle sensor with GMR or MTJ elements Magnetic field angle sensor with GMR or MTJ elements

2008-07-01

2008-07-01

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

C324S207210, C324S207250, C324S249000, C360S324000, C365S158000, C365S171000

Reexamination Certificate

active

07394247

ABSTRACT:
The invention discloses a sensor for 360-degree magnetic field angle measurement. It comprises multiple GMR (or MTJ) stripes with identical geometries except for their orientations. These are used as the building blocks for a pair of Wheatstone bridges that signal the direction of magnetization of their environment. The design greatly enhances sensitivity within GMR stripes and does not require an additional Hall sensor in order to cover the full 360 degree measurement range.

REFERENCES:
patent: 6640652 (2003-11-01), Kikuchi et al.
patent: 6927566 (2005-08-01), Apel et al.
patent: 7005958 (2006-02-01), Wan
patent: 7095596 (2006-08-01), Schmollngruber et al.
“Exchange Anisotropy and Micromagnetic Properties of PtMn/NiFe Bilayers”, by Taras Pokhil et al., Jrnl. of Appl. Physics, vol. 89, No. 11, Jun. 1, 2001, pp. 6588-6590.
Honeywell Application Note “Applications of Magnetic Position Sensors”, AN211, pp. 1-8.

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