Longitudinal magnetic media having a granular magnetic layer

Details Longitudinal magnetic media having a granular magnetic layer Longitudinal magnetic media having a granular magnetic layer

2004-04-22

2008-08-05

Rickman, Holly (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S831200

Reexamination Certificate

active

07407719

ABSTRACT:
A novel method of manufacturing a longitudinal granular oxide recording medium is disclosed. The method preferably entails obtaining a non-magnetic substrate, heating the substrate at a temperature T1that is greater than 150° C., forming a first layer with body-centered cubic atomic structure and with a <200> preferred growth orientation, cooling the substrate to a temperature T2and forming a second layer comprising a magnetic oxide-containing granular magnetic layer with a hexagonal close packed atomic structure and with a <11-20> preferred growth orientation. The magnetic oxide-containing granular magnetic layer contains magnetic crystal grains that are substantially isolated by an inter-granular region comprising a non-magnetic substance, wherein the non-magnetic substance is preferably an oxide-containing material.

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