US 6,646,827 B1 · Perpendicular magnetic recording head with write pole which reduces flux antenna effect

Abstract

A perpendicular magnetic recording head includes a write pole designed to reduce or eliminate problems caused by stray magnetic fields. By positioning a write coil close to the air bearing surface of the recording head, and controlling the geometry of the write pole, the necessity of a return pole to provide a closed magnetic flux path through the write pole and the magnetic recording media is eliminated. The use of an open magnetic path produced by a single write pole reduces or eliminates problems caused by stray magnetic fields which, in conventional perpendicular magnetic recording head designs, travel through the soft magnetic underlayer of the recording media and enter the recording head through the return pole.

Claims18

Dependent claims

A perpendicular magnetic recording head comprising:

a write pole including a tip located adjacent an air bearing surface of the recording head and a yoke having a thickness greater than a thickness of the write pole tip located away from the air bearing surface;
and
a magnetizing coil positioned in proximity to the air bearing surface and at least partially surrounding the yoke for generating magnetic flux in the write pole, wherein the magnetizing coil is oriented in a plane substantially parallel with the air bearing surface and has a lower surface located a substantially uniform distance from the air bearing surface.

Dependencies are inferred from the claim text.

Facts

Application

09/757,433Filed 10 Jan 2001 · us provisional application

Priority

10 Jan 2000

Granted

11 Nov 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

G11B 5/1278
Structure or manufacture of heads, e.g. inductive: specially adapted for magnetisations perpendicular to the surface of the record carrier
G11B 5/17
Structure or manufacture of heads, e.g. inductive: construction or disposition of windings
G11B 2005/0029
Pulse recording: using magnetisation components of the recording layer disposed mainly perpendicularly to the record carrier surface
G11B
Information storage based on relative movement between record carrier and transducer

Perpendicular magnetic recording head with write pole which reduces flux antenna effect

Life of this patent

Perpendicular magnetic recording head with write pole which reduces flux antenna effect

Life of this patent

Abstract

Claims18