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Recording Medium

IP.com Disclosure Number: IPCOM000094217D
Original Publication Date: 1966-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

Bate, G: AUTHOR [+3]

Abstract

This thin, metallic recording film is formed to reduce the gradual wearing away of its outer surface and also to eliminate the progressive loss of platelets at the substrate-recording surface interface. Recording medium 10 is formed with substrate 11 which can be MYLAR*. Iron oxide layer 12 which is less than 1000 Angstrom thick is first deposited on the substrate. Ferromagnetic recording layer 13 is then deposited on layer 12. The use of layer 12 improves the adhesion of the recording layer to the substrate. To assure that layers 12 and 13 adhere to each other, an intermediate layer 14 blends layers 12 and 13 together. Layer 14 is formed of iron oxide and the ferromagnetic material.

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Recording Medium

This thin, metallic recording film is formed to reduce the gradual wearing away of its outer surface and also to eliminate the progressive loss of platelets at the substrate-recording surface interface. Recording medium 10 is formed with substrate 11 which can be MYLAR*. Iron oxide layer 12 which is less than 1000 Angstrom thick is first deposited on the substrate. Ferromagnetic recording layer 13 is then deposited on layer 12. The use of layer 12 improves the adhesion of the recording layer to the substrate. To assure that layers 12 and 13 adhere to each other, an intermediate layer 14 blends layers 12 and 13 together. Layer 14 is formed of iron oxide and the ferromagnetic material.

The layers 12... 14 can be deposited electrolessly or by vacuum deposition methods. To accomplish the blending of layer 12 with layer 13 by a vacuum deposition, a low vacuum of approximately 10/-3/ mm. of mercury is used in the beginning of the process. The level of the vacuum is lowered during the process to a value of about 10/-5/ mm. of mercury.

To decrease the wear of the recording medium, a bonding layer of chromium oxide 15 is provided as the outer surface of the film. Layer 15 offers resistance to wear. To ensure bonding layer 15 to layer 13, an intermediate layer 16 blends layers 13 and 15 and is formed of chromium oxide and the ferromagnetic material. This assures a substantial improvement in the bond without any loss in the magnetic properties of the medium...