US 12,437,780 B2 · DFL TDMR middle shield throat height control for improved stability

Abstract

The present disclosure generally relates to a dual free layer two dimensional magnetic recording read head. The read head comprises a lower shield, a first sensor disposed over the first lower shield, a first rear hard bias (RHB) structure recessed from a media facing surface (MFS), a first upper shield disposed over the first sensor, a middle shield disposed over the first sensor at the MFS, a second sensor disposed over the middle shield, a second RHB structure recessed from the MFS, and an upper shield disposed over the second sensor. The middle shield has a U-like shape and a ratio of a width to a throat height of 6:1, where the throat height is less than or equal to about 2 μm. The first and second RHB structures each individually has a stripe height about 3 times greater than a stripe height of the middle shield.

Claims19

Dependent claims

A read head, comprising:

a lower shield;
a first sensor disposed over the lower shield;
a first upper shield disposed over the first sensor;
a middle shield disposed over the first upper shield, the middle shield comprising a first portion disposed at a media facing surface, a first leg coupled to the first portion, and a second leg coupled to the first portion, wherein a ratio of a width to a throat height of the middle shield is 6:1 or greater, the throat height being defined by a thickness of the first portion from the media facing surface;
a second sensor disposed over the middle shield, wherein the first sensor and the second sensor each individually comprises a first free layer and a second free layer;
and
a second upper shield disposed over the second sensor.

4 more elements

Dependencies are inferred from the claim text.

DFL TDMR middle shield throat height control for improved stability

Life of this patent

DFL TDMR middle shield throat height control for improved stability

Life of this patent

Abstract

Claims19