EP0124293A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Thin film tranducer head for inductive recording and magnetoresistive reading
Assignee: HP Inc
•
Filing: 1984-04-02
•
Granted: —
•
Expires: 2004-04-02
Abstract
Abstract © A thin film transducer is provided for inductively recording and magnetorestrictively reading magnetic information. A thin film magnetorestrictive (MR) element (28) is mounted on a bottom yoke member (20) and is provided with means, which may be a pair of legs of the MR material extending in the same direction, so as to define a single magnetic domain in the MR element. A read conductor (30) is provided in the form of a «barber pole» so that the angled transducer gap thereof overlies the magnetic domain in the MR element. The bottom yoke (20) is a planar surface essentially dimensionless with respect to the other elements of the transducer head while a top yoke (24) is specifically shaped so as to have a tail portion (24") which overlies a write conductor (22) and is parallel to the transducer gap in the read conductor (30).
Inventors
- 👤 Mike L. Covault
- 👤 Ralph F. Simmons
- 👤 Bruce J. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 19:20
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/398; G11B5/31; G11B5/3967
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
163 words
A thin film transducer for inductively recording and magnetorestrictively reading magnetic information, and comprising a non-magnetic substrate (2); a first thin film yoke member (20) of magnetic material disposed on a surface of said substrate; the transducer being characterized by a thin film magnetoresistive element (28) insulatingly mounted on said first yoke member and having means for defining a single magnetic domain in a predetermined portion thereof; a thin film read conductor (30) of electrically conductive material disposed over said magnetoresistive element (28) and having a transducer gap therein whose sides are at an acute angle with respect to the principal longitudinal axis thereof and overlying said magnetic domain in said magnetoresistive element; a thin film write conductor (22) of electrically conductive material insulatingly disposed on and in substantial alignment with said read conductor (30); and a second thin film yoke member (24) of magnetic material insulatingly disposed on said write conductor (22) and overlying said transducer gap in said read conductor (30).
Claim 2
Dependent Claim
163 words
A thin film transducer for inductively recording and magnetorestrictively reading magnetic information, and comprising a non-magnetic substrate (2); a first thin film yoke member (20) of magnetic material disposed on a surface of said substrate; the transducer being characterized by a thin film magnetoresistive element (28) insulatingly mounted on said first yoke member and having means for defining a single magnetic domain in a predetermined portion thereof; a thin film read conductor (30) of electrically conductive material disposed over said magnetoresistive element (28) and having a transducer gap therein whose sides are at an acute angle with respect to the principal longitudinal axis thereof and overlying said magnetic domain in said magnetoresistive element; a thin film write conductor (22) of electrically conductive material insulatingly disposed on and in substantial alignment with said read conductor (30); and a second thin film yoke member (24) of magnetic material insulatingly disposed on said write conductor (22) and overlying said transducer gap in said read conductor (30).
Claim 3
Dependent Claim
52 words
A transducer according to claim 1 characterized in that said means for defining said single magnetic domain in a predetermined portion of said magnetoresistive element comprises a pair of legs of magnetoresistive material integral with said magnetoresistive element and extending in the same direction from the principal axis of said magnetoresistive element.
Claim 4
Dependent Claim
20 words
A transducer according to claim 2 characterized in that said magnetoresistive element and said legs lie in the same plane.
Claim 5
Dependent Claim
41 words
A transducer according to any one of the preceding claims characterized in that said second yoke member (24) has a tail portion (24") which overlies said write conductor (22) and is parallel to said transducer gap in said read conductor (30).
Claim 6
Dependent Claim
20 words
A transducer according to any one of the preceding claims characterized in that said acute angle is about 34 degrees.
Claim 7
Dependent Claim
38 words
A transducer according to any one of the preceding claims characterized in that said transducer gap in said read conductor (30) includes a biasing conductor member of electrically conductive material parallel to the sides of said transducer gap.
Claim 8
Dependent Claim
156 words
A thin film transducer for inductively recording and magnetorestrictively reading magnetic information and comprising a non-magnetic substrate (2); and being characterized by a first thin film yoke member (20) of magnetic material disposed on a surface of said substrate; a thin film magnetoresistive element (28) insulatingly mounted on said first yoke member and having means for defining a single magnetic domain in a predetermined portion thereof; a thin film read conductor (30) of electrically conductive material disposed over said magnetoresistive element having a transducer gap therein and including means for causing current to flow across said gap at an acute angle with respect to the principle longitudinal axis thereof; a thin film write conductor (22) of electrically conductive material insulatingly disposed on and in substantial alignment with said read conductor; and a second thin film yoke member (24) of magnetic material insulatingly disposed on said write conductor and overlying said transducer gap in said read conductor.
Claim 9
Dependent Claim
156 words
A thin film transducer for inductively recording and magnetorestrictively reading magnetic information and comprising a non-magnetic substrate (2); and being characterized by a first thin film yoke member (20) of magnetic material disposed on a surface of said substrate; a thin film magnetoresistive element (28) insulatingly mounted on said first yoke member and having means for defining a single magnetic domain in a predetermined portion thereof; a thin film read conductor (30) of electrically conductive material disposed over said magnetoresistive element having a transducer gap therein and including means for causing current to flow across said gap at an acute angle with respect to the principle longitudinal axis thereof; a thin film write conductor (22) of electrically conductive material insulatingly disposed on and in substantial alignment with said read conductor; and a second thin film yoke member (24) of magnetic material insulatingly disposed on said write conductor and overlying said transducer gap in said read conductor.
Claim 10
Dependent Claim
16 words
A transducer according to claim 8 characterized in that said acute angle is about 34 degrees.
Claim 11
Dependent Claim
54 words
A transducer according to either one of claims 7 and 8 characterized in that said means for defining said single magnetic domain in said magnetoresistive element (28) comprises a pair of legs of magnetoresistive material integral with said magnetoresistive element and extending in the same direction from the principal axis of said magnetoresistive element.
Claim 12
Dependent Claim
46 words
A transducer according to any one of claims 7 to 9 characterized in that said second yoke member (24) has a tail portion (24") which overlies said write conductor (22) at said acute angle and is parallel to said transducer gap in said read conductor (30).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.