Magnetoresistive sensing device for detection of magnetic fields having a shape anisotropy field and uniaxial anisotropy field which are perpendicular
Abstract
Abstract A MAGNETORESISTIVE SENSING DEVICE FOR DETECTION OF MAGNETIC FLUX, COMPRISING A MAGNETORESISTIVE SENSING ELEMENT IN WHICH THE SHAPE ANISOTROPY FIELD IS SUBSTANTIALLY PERPENDICULAR TO THE UNIAXIAL ANISOTROPY FIELD. THE LARGER OF THESE TOW MAGNETIC FIELDS IS IN A DIRECTION WHICH IS SUBSTANTIALLY NORMAL TO THE DIRECTION OF THE SIGNAL FLUX WHICH IS TO BE DETECTED, TO INSURE THAT THE MAGNETIZATION VECTOR OF THE SENSING ELEMENT WILL RETURN TO ITS REST STATE WHEN THE SIGNAL MAGNETIC FLUX IS REMOVED. THE EASY AXIS OF THE SENSING ELEMENT CAN BE EITHER PARALLEL OR NORMAL TO THE SIGNAL MAGNETIC FIELD DIRECTION. CURRENT THROUGH THE SENSING ELEMTN IS PREFERABLY PROVIDED BY A CONSTANT CURRENT SOURCE CONNECTED TO THE ELEMENT. THE DIRECTION OF CURRENT THROUGH THE ELEMENT CAN BE EITHER ALONG THE DIRECTION OF THE QUIESCENT MAGNETIZATION STATE OR PERPENDICULAR TO IT. APPLICATIONS INCLUDE MAGNETIC BUBBLE DOMAIN SENSING AND SENSING OF STORED MAGNETIC SIGNALS ON DISKS OR TAPES.
Inventors
- 👤 G Almasi
- 👤 G Keefe
- 👤 Y Lin
- 👤 D Thompson
Bibliographic Details
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