Longitudinally biased magnetoresistive sensor having a concave shaped active region to reduce Barkhausen noise by achieving a substantially single magnetic domain state
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United States of America Patent
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Aug 5, 1997
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N/A
app pub date -
Nov 30, 1995
filing date -
Nov 30, 1995
priority date (Note) -
Expired
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Abstract
A magnetoresistive ('MR') sensor constructed with a concave shaped edge in order to provide an effective longitudinal bias field in the center of the active MR element sufficient to obviate multi-domain states and concomitant Barkhausen noise. Utilizing the concave shape proposed herein, the 'stripe height' of the element is at a minimum in the center of the active region and increases toward the off-track boundary. In a preferred embodiment, a substantially constant effective longitudinal bias field may be obtained throughout the active MR element if the stripe height increases as an exponential function of the square of the off-track distance. The principles of the present invention are likewise applicable to use in spin valve ('SV') and other giant magnetoresistive ('GMR') sensors.
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