Multi-impact thermal asperity sensor head

Details Multi-impact thermal asperity sensor head Multi-impact thermal asperity sensor head

1997-04-01

1998-10-20

Patidar, Jay M.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360103, 360113, G01R 100

Patent

active

058251812

ABSTRACT:
An asperity height sensing head and method of using the same are disclosed. The head includes multiple magnetoresistive (MR) sensors carried by a first rail of a slider adjacent to the air bearing surface (ABS) and positioned a distance L.sub.p from each other. Asperity height estimating circuitry coupled to each of the multiple MR sensors detects a number N of the MR sensors which exhibit a change in resistance as a result of contact between the ABS and a first asperity on the surface of the disc. The asperity height estimating circuitry estimates the height H.sub.A of the first asperity as a function of the number N, as a function of the pitch angle .theta..sub.p , and as a function of the distance L.sub.p.

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