G - Physics – 11 – B
Patent
G - Physics
11
B
352/29.1
G11B 5/60 (2006.01) G11B 21/21 (2006.01)
Patent
CA 1290054
SZ 9-85-01C A B S T R A C T Method and Apparatus for Controlling the Flying Height of the Head in a Magnetic Storage Unit The method involves the steps of lowering the magnetic head (8) to within aerodynamic distance from the surface (16) of a moving recording medium, enforced further lowering of the head (8) until a tunnel current occurs across the gap between head (8) and surface (16), and maintaining said tunnel current constant by using the deviations of the current from a predetermined value (which corresponds to a certain flying height). The apparatus comprises a tunnel electrode (9) forming an integral part of the head assembly which is attached to a distance control mechanism (5) permitting the positioning of the head assembly with a one-nanometer accuracy. The tunnel electrode (9) has a very slightly beveled shoulder (45, 47) ensuring early detection of asperities approaching the head while sitting on the surface (16) of the moving recording medium (3). Grada- tion of the potential between tunnel electrode (9) and surface (16) of the recording medium (3) is used to enhance the response to asperities.
519019
Gimzewski James Kazimierz
Muralt Paul Rene
Pohl Wolfgang Dieter
International Business Machines Corporation
Saunders Raymond H.
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