Shinji Narishige1, Mitsuo Sato1, Masateru Suwa1 and Sadami Tomita1
1Hitachi Research Laboratory, Hitachi Ltd., Hitachi
The initial wear and effects of hardness, tape speed, tape tension and relative humidity on the wear of permalloys and SUS 304 by a lapping tape for magnetic head and by a magnetic tape have been investigated. The initial wear was found to result mainly from virginity of tape and partly from virginity of alloy. The wear did not vary with the hardness, tape speed and tape tension but remarkably with the tape brand and relative humidity. The humidity dependence differed by the tape brand and the alloy. When the relative humidity was varied from 50 to 60%, the wear of permalloys increased by more than two times while that of SUS 304 was almost unchanged. SUS 304 had higher wear resistance than permalloys under an identical condition. Alloy surfaces worn by tape were investigated by Auger electron emission spectroscopy. An oxygen enriched layer was found to exist in the alloy surface when the alloy was slightly worn by a tape. On the other hand, the oxygen-enriched layer was not found in the alloy which was highly worn.
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