Browse Prior Art Database

Stabilizing Film for Magnetic Materials

IP.com Disclosure Number: IPCOM000075275D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Phipps, PB: AUTHOR [+2]

Abstract

Films of poly (monochloro-p-xylene), commercially available as Parylene C*, are used as a coating material to completely enclose magnetic films, such as utilized by magnetic disks and tapes, for environmental protection. The coating is thin and free from pin holes and may be deposited at low temperatures. This material also has a stabilizing effect on various magnetic materials. For example, europium oxide or europium oxide films doped with iron, europium; or any of the other various dopants known to beneficially affect the performance of these materials magnetically are generally chemically unstable. In order to make a useable device from these materials, it is necessary to coat them with an effectively passifying layer which will exclude the atmosphere and stabilize the films chemically and magnetically.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 96% of the total text.

Page 1 of 1

Stabilizing Film for Magnetic Materials

Films of poly (monochloro-p-xylene), commercially available as Parylene C*, are used as a coating material to completely enclose magnetic films, such as utilized by magnetic disks and tapes, for environmental protection. The coating is thin and free from pin holes and may be deposited at low temperatures. This material also has a stabilizing effect on various magnetic materials.

For example, europium oxide or europium oxide films doped with iron, europium; or any of the other various dopants known to beneficially affect the performance of these materials magnetically are generally chemically unstable. In order to make a useable device from these materials, it is necessary to coat them with an effectively passifying layer which will exclude the atmosphere and stabilize the films chemically and magnetically. At the same time, the passifying layer must not react with the magnetic material either during the coating process or afterwards. This coating must also be compatible with thermal excursions to which the magnetic film is to be subjected. Further, if the magnetic material is to be used in a light-beam addressable mode, the coating must also be transparent to the light used to switch the magnetic material. Parylene C meets these requirements effectively for europium oxide and doped europium oxide films. Additionally, such films may successfully be utilized with iron oxide films and other magnetic material as a stable passif...