US 7,443,633 B2 · Thin-film magnetic head for perpendicular magnetic recording and manufacturing method of thin-film magnetic head

Abstract

A thin-film magnetic head with which an error rate is decreased due to a reduction of a jitter without significant decrease in write field, is provided. The head comprises at least one inductive write head element comprising: a main magnetic pole layer having an inner saturation magnetic flux density varying from both side end surfaces in a track-width direction and a leading end surface, toward a center portion in the track-width direction of a trailing end surface; an auxiliary magnetic pole layer; and at least one coil layer, a curvature width WC of a contour line of a write field adjacent to a trailing edge on an ABS side of the main magnetic pole layer satisfying the following expression: −0.15*WT≦WC<12 where WT is a track width and a unit of WC and WT is nanometer.

Claims42

Dependent claims

A thin-film magnetic head comprising at least one inductive write head element comprising:

a main magnetic pole layer having an inner saturation magnetic flux density varying from both side end surfaces in a track-width direction and a leading end surface of said main magnetic pole layer, toward a center portion in said track-width direction of a trailing end surface of said main magnetic pole layer, for generating a write field;
an auxiliary magnetic pole layer having one end portion being adjacent to one end portion of said main magnetic pole layer and the other end portion connected magnetically with the other end portion of said main magnetic pole layer;
and
at least one coil layer formed in such a way as to pass through between said main magnetic pole layer and said auxiliary magnetic pole layer for inducing a magnetic flux in said main magnetic pole layer and said auxiliary magnetic pole layer,
a curvature width WC of a contour line of said write field adjacent to a trailing edge on an air bearing surface side of said main magnetic pole layer satisfying the following expression:
−0.15*WT≦WC<12
where WT is a track width and a unit of WC and WT is nanometer.

4 more elements

A thin-film magnetic head comprising at least one inductive write head element comprising:

a main magnetic pole layer having an inner saturation magnetic flux density varying from both side end surfaces in a track-width direction and a leading end surface of said main magnetic pole layer, toward a center portion in said track-width direction of a trailing end surface of said main magnetic pole layer, for generating a write field;
an auxiliary magnetic pole layer having one end portion being adjacent to one end portion of said main magnetic pole layer and the other end portion connected magnetically with the other end portion of said main magnetic pole layer;
and
at least one coil layer formed in such a way as to pass through between said main magnetic pole layer and said auxiliary magnetic pole layer for inducing a magnetic flux in said main magnetic pole layer and said auxiliary magnetic pole layer,
a slope α of a regression line obtained by least square method of a distribution of said inner saturation magnetic flux density under a condition that a positive direction of position coordinate is defined as a direction from said both side end surfaces and said leading end surface toward said center portion of said trailing end surface, satisfying the following expression:
−(0.000157*WT+0.0126)≦α<0
where a unit of α is Tesla/nm, WT is a track width, and a unit of WC and WT is nanometer.

4 more elements

A head gimbal assembly comprising:

a thin-film magnetic head comprising at least one inductive write head element comprising:
a main magnetic pole layer having an inner saturation magnetic flux density varying from both side end surfaces in a track-width direction and a leading end surface of said main magnetic pole layer, toward a center portion in said track-width direction of a trailing end surface of said main magnetic pole layer, for generating a write field;
an auxiliary magnetic pole layer having one end portion being adjacent to one end portion of said main magnetic pole layer and the other end portion connected magnetically with the other end portion of said main magnetic pole layer;
and
at least one coil layer formed in such a way as to pass through between said main magnetic pole layer and said auxiliary magnetic pole layer for inducing a magnetic flux in said main magnetic pole layer and said auxiliary magnetic pole layer,
a curvature width WC of a contour line of said write field adjacent to a trailing edge on an air bearing surface side of said main magnetic pole layer satisfying the following expression:
−0.15*WT≦WC<12
where WT is a track width and a unit of WC and WT is nanometer;
and
a support structure for supporting said thin-film magnetic head.

7 more elements

A head gimbal assembly comprising:

a thin-film magnetic head comprising at least one inductive write head element comprising:
a main magnetic pole layer having an inner saturation magnetic flux density varying from both side end surfaces in a track-width direction and a leading end surface of said main magnetic pole layer, toward a center portion in said track-width direction of a trailing end surface of said main magnetic pole layer, for generating a write field;
an auxiliary magnetic pole layer having one end portion being adjacent to one end portion of said main magnetic pole layer and the other end portion connected magnetically with the other end portion of said main magnetic pole layer;
and
at least one coil layer formed in such a way as to pass through between said main magnetic pole layer and said auxiliary magnetic pole layer for inducing a magnetic flux in said main magnetic pole layer and said auxiliary magnetic pole layer,
a slope α of a regression line obtained by least square method of a distribution of said inner saturation magnetic flux density under a condition that a positive direction of position coordinate is defined as a direction from said both side end surfaces and said leading end surface toward said center portion of said trailing end surface, satisfying the following expression:
−(0.000157*WT+0.0126)≦α<0
where a unit of α is Tesla/nm, WT is a track width, and a unit of WC and WT is nanometer;
and
a support structure for supporting said thin-film magnetic head.

7 more elements

A magnetic disk drive apparatus comprising:

at least one head gimbal assembly comprising:
a thin-film magnetic head comprising at least one inductive write head element comprising:
a main magnetic pole layer having an inner saturation magnetic flux density varying from both side end surfaces in a track-width direction and a leading end surface of said main magnetic pole layer, toward a center portion in said track-width direction of a trailing end surface of said main magnetic pole layer, for generating a write field;
an auxiliary magnetic pole layer having one end portion being adjacent to one end portion of said main magnetic pole layer and the other end portion connected magnetically with the other end portion of said main magnetic pole layer;
and
at least one coil layer formed in such a way as to pass through between said main magnetic pole layer and said auxiliary magnetic pole layer for inducing a magnetic flux in said main magnetic pole layer and said auxiliary magnetic pole layer,
a curvature width WC of a contour line of said write field adjacent to a trailing edge on an air bearing surface side of said main magnetic pole layer satisfying the following expression:
−0.15*WT≦WC<12
where WT is a track width and a unit of WC and WT is nanometer;
and
a support structure for supporting said thin-film magnetic head;
and
at least one magnetic disk;
and
a recording/reproducing control means for controlling read and write operations of said thin-film magnetic head to said at least one magnetic disk.

12 more elements

A magnetic disk drive apparatus comprising:

at least one head gimbal assembly comprising:
a thin-film magnetic head comprising at least one inductive write head element comprising:
a main magnetic pole layer having an inner saturation magnetic flux density varying from both side end surfaces in a track-width direction and a leading end surface of said main magnetic pole layer, toward a center portion in said track-width direction of a trailing end surface of said main magnetic pole layer, for generating a write field;
an auxiliary magnetic pole layer having one end portion being adjacent to one end portion of said main magnetic pole layer and the other end portion connected magnetically with the other end portion of said main magnetic pole layer;
and
at least one coil layer formed in such a way as to pass through between said main magnetic pole layer and said auxiliary magnetic pole layer for inducing a magnetic flux in said main magnetic pole layer and said auxiliary magnetic pole layer,
a slope α of a regression line obtained by least square method of a distribution of said inner saturation magnetic flux density under a condition that a positive direction of position coordinate is defined as a direction from said both side end surfaces and said leading end surface toward said center portion of said trailing end surface, satisfying the following expression:
−(0.000157*WT+0.0126)≦α<0
where a unit of α is Tesla/nm, WT is a track width, and a unit of WC and WT is nanometer;
and
a support structure for supporting said thin-film magnetic head;
and
at least one magnetic disk;
and
a recording/reproducing control means for controlling read and write operations of said thin-film magnetic head to said at least one magnetic disk.

12 more elements

Dependencies are inferred from the claim text.

Thin-film magnetic head for perpendicular magnetic recording and manufacturing method of thin-film magnetic head

Life of this patent

Thin-film magnetic head for perpendicular magnetic recording and manufacturing method of thin-film magnetic head

Life of this patent

Abstract

Claims42