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The performance of a magnetoresistive (MR) sensor is improved by changing the biasing and signal decay characteristics by extending the magnetic length of the sensor.
English (United States)
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Magnetoresistive Sensing Device
The performance of a magnetoresistive (MR) sensor is improved by
changing the biasing and signal decay characteristics by extending the magnetic
length of the sensor.
As depicted in Fig. 1, a laminated arrangement includes an MR sensor 1
formed as a permalloy layer which is disposed between conductive elements 2
and 3. A nonconductive thin film separator 4, made from SiO(2) or Al(2)O(3), is
deposited over the MR sensor 1 and overlaps the ends of the sensor layer. A
magnetic thin film layer 5 is then deposited on the separator 4 to serve as a
magnetic flux sink. The flux sink 5 also overlays the MR sensor layer. The
sensor 1 serves to read recorded data on a magnetic medium and for this
purpose is located at the air bearing surface (ABS) of the magnetic sensing
device. Shields 6 and 7 are provided on each side of the MR sensor.
Alternative configurations include a discontinuous flux sink, as illustrated in
Fig. 2, and an arrangement having a slotted long MR stripe, as depicted in Fig. 3.
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