US 8,477,453 B2Granted

Perpendicular magnetic recording write head with milling defined track width

AssigneeHeadway Technologies, Inc.

InventorsKenichi Takano, Yuchen Zhou, Min Li, Joe Smyth

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Abstract

A main pole layer having at least a leading taper and trimmed pole tip portion is described. The leading taper increases head field up to ≧15000 Oe even for narrow track widths approaching 50 nm. For MAMR applications, a STO and trailing shield are sequentially formed on a trailing pole tip side. Furthermore, full side shields may be added to reduce fringing field. Another embodiment involves including both of a leading taper and trailing taper at the pole tip where leading taper angle is between 20° and 60° and trailing taper angle is from 10° to 45°. A method is provided for forming various embodiments of the present invention. A key feature is that milling depth at an effective neck height distance is greater than or equal to the pole tip thickness. A self aligned STO may be formed by the same ion milling step that defines track width.

Claims6

Dependent claims

A PMR write head with a main pole layer having a planar top surface, and a planar bottom surface that is formed parallel to said planar top surface and connected to an air bearing surface (ABS) by a tapered leading side, said main pole layer comprises:

(a) a pole tip portion, comprising:
(1) a pole tip formed along the ABS and having a leading edge where the tapered leading side terminates, and a trailing edge at the ABS and located a pole tip thickness from the leading edge and having a track width in a cross-track direction;
(2) a top surface that is part of the main pole planar top surface and extends from said trailing edge to a first plane that is parallel to the ABS and is formed a neck height distance from the ABS;
(3) two sides that are separated by a track width distance along the top surface, and connect the top surface to a bottom surface;
and
(4) a bottom surface with a first section formed along the tapered leading side between the ABS and a main pole surface that is aligned parallel to said planar top surface and has a front edge formed a first distance from the ABS, and a second section that is coplanar with said main pole surface and extends from the tapered leading side to said first plane;
(b) the main pole surface adjoining the second section of the bottom surface on each side of the pole tip portion wherein the front edge extends a second distance from a side of the pole tip portion in a cross-track direction to a long side that extends from the front edge in a direction perpendicular to the ABS to a second plane formed on an opposite side of the first plane with respect to the ABS, said second plane is parallel to the first plane;
and
(c) a side of the main pole layer formed between the main pole surface and planar top surface, and between the first plane and the second plane.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/799,927Filed 5 May 2010
Published: US 2011/0273800 A110 Nov 2011
Granted: 2 Jul 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 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 5/3116
Details: shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect,…
G11B 5/314
Including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat…:…
G11B 5/315
Magnetic layers: shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads