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Proceedings Paper

Contact force measurements at the head/disk interface for contact recording heads in magnetic recording
Author(s): S. K. Ganapathi; Mark Donovan; Yiao-Tee Hsia
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Paper Abstract

As the spacing between the magnetic transducer and media decreases in hard disk drives, one approaches the regime of constant contact between the head and disk. In this regime, conventional measures of the head/disk interface such as 'takeoff velocity' and 'fly height' become less important. Instead, the 'contact force' between the head and the disk is a more relevant parameter to evaluate the performance and reliability of the interface. In this paper, a new contact force measurement technique that uses the acoustic emission (AE) from the interface is introduced. The contact force is modeled as a series of continuous collisions that cause the slider to vibrate at its resonant frequencies. These vibrations generate an AE signal, the magnitude of which is proportional to the contact force. The Read-Rite tripad slider, which is a contact recording head, is used for the measurements. Some intuitive expectations from contact force measurements are presented as validation of the technique. Specifically, it is shown that contact force decreases with increasing disk velocity, that the contact force varies inversely with the flying height measured on a glass disk, and that the contact force decreases with burnishing of the interface.

Paper Details

Date Published: 15 January 1996
PDF: 8 pages
Proc. SPIE 2604, High-Density Data Recording and Retrieval Technologies, (15 January 1996); doi: 10.1117/12.230060
Show Author Affiliations
S. K. Ganapathi, Read-Rite Corp. (United States)
Mark Donovan, Read-Rite Corp. (United States)
Yiao-Tee Hsia, Read-Rite Corp. (United States)

Published in SPIE Proceedings Vol. 2604:
High-Density Data Recording and Retrieval Technologies
Ted A. Schwarz; Martin Francis, Editor(s)

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