Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate
2007-10-01
2008-05-20
Aurora, Reena (Department: 2862)
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
C324S209000
Reexamination Certificate
active
07375513
ABSTRACT:
A method for measuring a magnetostriction value of a magnetoresistive element according to one embodiment includes placing a substrate carrying one or more magnetoresistive elements on a fixture; applying a first magnetic field about parallel to the substrate; applying a second magnetic field about perpendicular to the substrate and about parallel to magnetoresistive layers of the one or more elements; measuring a signal from at least one of the one or more elements; applying a mechanical stress to the substrate; and monitoring the signal from the at least one of the one or more elements while changing the first magnetic field.
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patent: 6664783 (2003-12-01), Baril et al.
Markham et al., Magnetoresistive Measurement of Magnetostriction in Permalloy, Sep. 1989, IEEE Transactions on Magnetics, vol. 25, No. 5, pp. 4198-4200.
Cates et al., Measurement of Magnetostriction in Self-Biased Shielded Magnetoresistive Heads, Nov. 1994, IEEE Transactions on Magnetics, vo. 30, No. 6, pp. 4572-4574.
Office Action Summary from U.S. Appl. No. 11/865,690 mailed Feb. 28, 2008.
Aurora Reena
Whittington Kenneth J.
Zilka-Kotab, PC
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