METHOD FOR MEASURING FLARE POINT HEIGHT OF PERPENDICULAR MAGNETIC RECORDING HEAD

WIPO Patent Application WO/2011/155271

A1

When measuring a magnetic field intensity change rate in order to estimate flare point height, measurement noise, etc., can obscure the difference in the rate of signal intensity change caused by the flare point dimensions, resulting in poor S/N ratios, making it difficult to estimate flare point height. By preparing samples having various flare points, and measuring magnetic field intensity at measurement points at which peak position spacing of a given standard can be obtained for each sample, accurately measuring flare point height in each of these samples using destructive measurement methods such as FIB and etching and preparing a database of the relationships between these flare point heights and magnetic field intensities, it is subsequently possible to estimate flare point height in that sample in a non-destructive manner by measuring the magnetic field intensity in the peak position spacing that becomes the new magnetic head sample standard and referring to the aforementioned database.

MATSUMURA Toru (HITACHI LTD., 292, Yoshida-cho, Totsuka-ku, Yokohama-sh, Kanagawa 17, 〒2440817, JP)
松村　徹 (〒17 神奈川県横浜市戸塚区吉田町２９２番地　株式会社日立製作所　横浜研究所内 Kanagawa, 〒2440817, JP)

JP2011/059946

December 15, 2011

April 22, 2011

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HITACHI, LTD. (6-6 Marunouchi 1-chome, Chiyoda-ku Tokyo, 80, 〒1008280, JP)
株式会社日立製作所 (〒80 東京都千代田区丸の内一丁目６番６号 Tokyo, 〒1008280, JP)
MATSUMURA Toru (HITACHI LTD., 292, Yoshida-cho, Totsuka-ku, Yokohama-sh, Kanagawa 17, 〒2440817, JP)

G11B5/455; G11B5/31

POLAIRE I.P.C. (7-1 Hatchobori 2-chome, Chuo-ku Tokyo, 32, 〒1040032, JP)

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