Browse Prior Art Database

MR TRANSDUCER (AMR) WITH COMMON MODE AND THERMAL ASPERITY NOISE REJECTION

IP.com Disclosure Number: IPCOM000013989D
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2003-Jun-19
Document File: 1 page(s) / 26K

Publishing Venue

IBM

Abstract

A magnetic recording sensor for use in close proximity with recording medium having thermal noise canceling structure.

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This is the abbreviated version, containing approximately 100% of the total text.

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  MR TRANSDUCER (AMR) WITH COMMON MODE AND THERMAL ASPERITY NOISE REJECTION

A magnetic recording sensor for use in close
proximity with recording medium having thermal
noise canceling structure.

As recording sensors are used in closer proximity
to the recording media the sensor is more
susceptible to thermally induced noise such as
baseline wander or thermal asperities. If a
conductor is placed in the same gap region as the
sensor but is electrically insulated from the
sensor then a non-magnetic thermally induced signal
from this conductor can be electronically
subtracted from the total sensor signal. The
resulting signal will contain the magnetic readback
signal without the thermally induced noise.

The conductor can be made of any conducting
material including, conveniently, the same material
as the sensor (but without magnetic biasing). The
insulating layer can be made of any insulating
material such as alumina. For best noise
cancellation the thermal properties and physical
volume of the conductor should be similar to that
of the sensor. The electronic cancellation can be
conveniently accomplished with a differential
amplifier with either current bias or voltage bias
applied to both the sensor and conductor.

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