U.S. Philips Corporation

Jacques C S Kools

Reinder Coehoorn

Derk Jan Adelerhof

Magnetic field sensor having nickel oxide and cobalt containing ferromagnetic layers

A thin film shielded magnetic read head device comprises an end face extending in a first direction, in which a magnetic information carrier is movable with respect to the magnetic head device, and in a second direction, perpendicular to said first direction. The magnetic head device further comprises shield forming flux guiding elements for magnetic cooperation with the information carrier, which elements extend in the second direction and in a third direction, perpendicular to the first and the second direction. A number of magnetoresistive elements each having a spin tunnel junction structure is provided, which number of magnetoresistive elements corresponds to with the number of magnetic channels of the magnetic head device. One of said shields forms a common contact lead for the current through said magnetoresistive elements. Thin film magnetic read head device is applied in a system for reading information from a magnetic information carrier.

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Fremont, CA, United States of America

Jacques C S Kools