US 7,407,719 B1Granted

Longitudinal magnetic media having a granular magnetic layer

AssigneeSeagate Technology LLC

InventorsErol Girt, Li-Lien Lee, Samuel D. Harkness, IV

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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 T1 that 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 T2 and 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.

Claims7

Dependent claims

A longitudinal granular oxide recording medium, comprising:

(a) at least one non-magnetic layer with body-centered cubic atomic structure with a (200) preferred growth orientation,
(b) at least one interlayer with hexagonal close packed atomic structure and with a <11-20> preferred growth orientation,
(c) at least one magnetic oxide-containing granular magnetic layer with hexagonal close packed atomic structure and with a <11-20> preferred growth orientation
wherein the interlayer comprises at least two layers:
a first interlayer, IL1, located above first layer (a) and comprising a Co—X alloy, wherein X is selected from the group consisting of Cr, Pt, Ta, B, W, Mo, Ru, Si, Cu, Ag, Ge, Nb, Fe, Ni, Au and combinations thereof, and a second interlayer, IL2, comprising a Ru—Y alloy, wherein Y is selected from the group consisting of Rh, Ir, Cr, Re, Co, V, W, Ta, Zr, Hf, Ti, Mo, Au and combinations thereof.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/829,164Filed 22 Apr 2004 · us provisional application
Priority: 24 Dec 2003
Granted: 5 Aug 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G11B 5/658
Characterised by its composition: containing oxygen, e.g. molecular oxygen or magnetic oxide
G11B 5/737
Two or more non-magnetic underlayers, e.g. seed layers or barrier layers: physical structure of underlayer, e.g. texture
G11B 5/7377
Non-polymeric layer under the lowermost magnetic recording layer: physical structure of underlayer, e.g. texture
G11B 5/7379
Non-polymeric layer under the lowermost magnetic recording layer: seed layer, e.g. at least one non-magnetic layer is specifically adapted as a…

Family

Application60/531,986Us provisional application · filed 24 Dec 2003
US 7,407,719 B1This patent

From the US filing history. Foreign family members aren’t listed.

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