Dynamic magnetic information storage or retrieval – Head – Head surface structure
Patent
1994-10-17
1997-06-03
Levy, Stuart S.
Dynamic magnetic information storage or retrieval
Head
Head surface structure
G11B 5187
Patent
active
056360924
ABSTRACT:
A magnetic head is provided with a protective film of chromium nitride on its sliding surface. The film thickness is set to have no adverse effect upon the electromagnetic conversion characteristics of the head, and the film has sufficient wear resistance not only against a magnetic tape having its sliding surface formed of iron oxide or other metallic magnetic substances, but also against a magnetic tape having its sliding surface formed of chrome oxide, the chrome oxide substance having a strong abrasion effect upon the magnetic head. The protective film has a compressive internal stress in a range of 10.sup.9 to 10.sup.11 dynes/cm.sup.2, a Knoop hardness of not less than 1500 kgf/mm.sup.2, a nitrogen composition ratio in a range of 20 to 60 atom %. The magnetic head core portion (23, 60) or non-magnetosensitive portion (25; 26, 61) has a plurality of minute projections (62) formed on the top surface thereof. The height of each projection is approximately equal to the size of each crystalline particle in diameter of the core portion or the non-magnetosensitive portion, where the maximum surface roughness is made greater than 150 .ANG..
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Nasu Shogo
Ryonai Hiroshi
Cao Allen
Levy Stuart S.
Matsushita Electric - Industrial Co., Ltd.
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