Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1989-02-13
1990-04-03
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
5116571, B24B 4900
Patent
active
049128833
ABSTRACT:
A lapping control system for a row of thin film magnetic transducers formed on a substrate. Each of the rows comprises a plurality of thin film magnetic transducers and at least two test structures. Each test structure has at least two elements which comprises some combination of switch elements or test thin film magnetic transducers. As the row of transducers is lapped, each time one of the switch elements is opened, the saturation current (ISAT) of one or more of the thin film magnetic transducers is measured and recorded so that a correlation between ISAT and throat height of the transducers is established during lapping. This correlation is used to establish the point at which lapping should be terminated.
REFERENCES:
patent: 3821815 (1974-06-01), Abbott et al.
patent: 4155106 (1979-05-01), Muraoka et al.
patent: 4477968 (1984-10-01), Kracke et al.
patent: 4509295 (1985-04-01), Bottcher et al.
patent: 4511942 (1985-04-01), Valstyn
patent: 4559743 (1985-12-01), Kracke et al.
patent: 4657451 (1987-04-01), Tanaka
patent: 4689877 (1987-09-01), Church
"Substrate Testing of Film Heads", Jones et al.; IEEE Trans. Magn., vol. 17, No, 6, p. 2896-2898 (1981).
Kawakami, et al.,; Electrical Detection of End Point in Polishing Process of Thin-Film Heads (Invited), J. Appl. Phys., vol. 61, No. 6, pp. 4613-4166 (1987).
Chang Mike Y.
Church Mark A.
Salo Michael P.
International Business Machines - Corporation
Rachuba M.
Schmid, Jr. Otto
Schmidt Frederick R.
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