IP Library › Granted Patent US 8,043,734
Granted Patent B2
US 8,043,734 · App. 12/178,540 · Granted Oct 25, 2011

Oxidized conformal capping layer

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Quick Facts
Patent No.
US 8,043,734
App. No.
12/178,540
Granted
Oct 25, 2011
Kind
B2
Abstract

The invention relates to granular perpendicular magnetic recording media with a capping layer comprised of a material having high surface mobility and low surface energy. The capping layer surface is oxidized to produce a passivating surface that is impervious to corrosion.

Claims (10)

1. A magnetic recording medium comprising

a substrate,

a granular magnetic layer,

a conformal cap layer, and

a carbon-containing or a silicon-containing overcoat directly on the cap layer, in this order,

wherein the cap layer consists of

(1) a material selected from the group consisting of titanium and alloys of titanium, and

(2) an oxidized form of the material on a surface of the cap layer.

2. The magnetic recording medium of claim 1 , wherein the material selected for the cap layer also has a glass transition temperature of less than 2600 K.

3. The magnetic recording medium of claim 1 , wherein the material selected for the cap layer also has a surface energy of less than 2.6 J/m 2 .

Assignments (6)
RELEASE OF SECURITY INTEREST Recorded Jul 23, 2025
From: THE BANK OF NOVA SCOTIA
To: SEAGATE TECHNOLOGY PUBLIC LIMITED COMPANY; SEAGATE TECHNOLOGY; SEAGATE TECHNOLOGY HDD HOLDINGS; I365 INC.; SEAGATE TECHNOLOGY LLC; SEAGATE TECHNOLOGY INTERNATIONAL; SEAGATE HDD CAYMAN; SEAGATE TECHNOLOGY (US) HOLDINGS, INC.
Reel/Frame 072193/0001 →
TERMINATION AND RELEASE OF SECURITY INTEREST IN PATENT RIGHTS Recorded Jul 19, 2013
From: WELLS FARGO BANK, NATIONAL ASSOCIATION, AS COLLATERAL AGENT AND SECOND PRIORITY REPRESENTATIVE
To: SEAGATE TECHNOLOGY LLC; EVAULT INC. (F/K/A I365 INC.); SEAGATE TECHNOLOGY INTERNATIONAL; SEAGATE TECHNOLOGY US HOLDINGS, INC.
Reel/Frame 030833/0001 →
SECURITY AGREEMENT Recorded Mar 24, 2011
From: SEAGATE TECHNOLOGY LLC
To: THE BANK OF NOVA SCOTIA, AS ADMINISTRATIVE AGENT
Reel/Frame 026010/0350 →
RELEASE Recorded Jan 19, 2011
From: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT
To: SEAGATE TECHNOLOGY HDD HOLDINGS; MAXTOR CORPORATION; SEAGATE TECHNOLOGY LLC; SEAGATE TECHNOLOGY INTERNATIONAL
Reel/Frame 025662/0001 →
SECURITY AGREEMENT Recorded May 15, 2009
From: MAXTOR CORPORATION; SEAGATE TECHNOLOGY LLC; SEAGATE TECHNOLOGY INTERNATIONAL
To: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT AND FIRST PRIORITY REPRESENTATIVE; WELLS FARGO BANK, NATIONAL ASSOCIATION, AS COLLATERAL AGENT AND SECOND PRIORITY REPRESENTATIVE
Reel/Frame 022757/0017 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 24, 2008
From: HARKNESS, SAMUEL DACKE, IV; WU, ZHONG STELLA
To: SEAGATE TECHNOLOGY LLC
Reel/Frame 021286/0616 →