US 12,518,781 B1 · Forming a heat channel on a magnetic write pole using an adhesion layer

Abstract

Described are write head constructions that may be useful in magnetic recording, and in particular for heat-assisted magnetic recording. Such write head constructions include a heat channel abutted to the write pole to facilitate transferring heat away from the write pole and other components near the media-facing surface of the write head. To help prevent diffusion of materials between the heat channel and the write pole, a diffusion barrier layer is provided. Properties such as thermal expansion mismatch, the presence of oxide in the diffusion barrier layer, and so forth, may lead to undesired delamination of the heat channel during fabrication of the write head and/or during operation. In accordance with the present disclosure, an adhesion layer may be provided between the diffusion barrier layer and the heat channel to improve adhesion of the heat channel and effectively reduce delamination.

Claims18

Dependent claims

A write head for magnetic recording on magnetic media positioned proximate to a media-facing surface of the write head, the write head comprising:

a write pole including a write pole tip extending to the media-facing surface;
a heat channel abutted to at least the write pole tip of the write pole and configured to conduct heat away from the media-facing surface;
a diffusion barrier layer disposed between the write pole tip and the heat channel, the diffusion barrier layer configured to substantially prevent interdiffusion of materials between the write pole tip and the heat channel;
and
an adhesion layer disposed between the diffusion barrier layer and the heat channel, the adhesion layer configured to substantially prevent delamination of the heat channel during exposure of the write head to elevated temperatures,
wherein the adhesion layer is comprised of a material having a first coefficient of thermal expansion, and the diffusion barrier layer is comprised of a material having a second coefficient of thermal expansion, the first coefficient of thermal expansion being within 50% of the second coefficient of thermal expansion.

3 more elements

Dependencies are inferred from the claim text.

Forming a heat channel on a magnetic write pole using an adhesion layer

Life of this patent

Forming a heat channel on a magnetic write pole using an adhesion layer

Life of this patent

Abstract

Claims18