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Thermal Heating of Slider Trailing Edge to Remove Contamination

IP.com Disclosure Number: IPCOM000118804D
Original Publication Date: 1997-Jul-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 81K

Publishing Venue

IBM

Related People

Smith, GJ: AUTHOR

Abstract

The trailing or rear portion of a slider in a hard disk storage device (hard drive) can collect foreign material contamination largely because the airflow behind a slider tends to deposit material there. Many of the contaminants are liquids which can be volatilized if their temperature can be raised sufficiently above the ambient temperature. Recognizing that the thin film inductive write element can dissipate heat energy, this energy is used to raise the temperature of the fluid contaminants which disperses them into the air. Removing the fluid in this way is important as the fluid can seep under the airbearing surfaces when the slider is at rest and result in very large stiction forces which can render the hard drive unusable.

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Thermal Heating of Slider Trailing Edge to Remove Contamination

      The trailing or rear portion of a slider in a hard disk storage
device (hard drive) can collect foreign material contamination
largely because the airflow behind a slider tends to deposit material
there.  Many of the contaminants are liquids which can be volatilized
if their temperature can be raised sufficiently above the ambient
temperature.  Recognizing that the thin film inductive write element
can dissipate heat energy, this energy is used to raise the
temperature of the fluid contaminants which disperses them into the
air. Removing  the fluid in this way is important as the fluid can
seep under the airbearing surfaces when the slider is at rest and
result in very large  stiction forces which can render the hard drive
unusable.

      In Fig. 1, a sketch of the rear portion of a slider is
shown.  The thin film coil is typically located on the center of the
trailing edge.  Foreign material, labeled Condensate, can accumulate
due to the high pressure gradients near the trailing edge of the
slider airbearing.  The coil is typically sealed so that direct
contact with the Condensate is impossible.  The close proximity of
the coil to the Condensate, however, provides a highly efficient path
for heat conduction  so that the Condensate can easily reach
temperatures of 50 to 75 degrees  Celsius above ambient.

      To most efficiently raise the temperature of the coil, a Direct
Current...