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Non-magnetic metrology layer for perpendicular pole

IP.com Disclosure Number: IPCOM000031484D
Publication Date: 2004-Sep-27
Document File: 1 page(s) / 11K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is an improvement that relates to a perpendicular magnetic recording head and, more particularly, to a write head pole tip with a non-magnetic metallic layer on top of said pole tip.

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HSJ820040099 Rambod Nader/US/HGST

Jeffrey Lille

Non-magnetic metrology layer for perpendicular pole

      As data densities increase in hard disk storage devices, the need for smaller write elements is needed to achieve these ever increasing densities. Disclosed herein is a pole tip structure that has a structural track width less than 150 nm. Similarly, the height (or thickness of the pole width) is less than 2-3x the track width. The limitation on the thickness is two-fold. First, the pole tip can not have an unlimited thickness because of the current configuration of the drive having a rotary actuator. This configuration creates the problem of having a skew where adjacent tracks can be written over at high skew angles if the pole tip is too thick. Second, is purely from a processing point of view where making ever increasing aspect ratio structures is difficult.

    Nevertheless, once such a small pole tip is created, the metrology of said pole tip will have to be accurate at these small dimensions at the air bearing surface (ABS) of the head. A small pole tip (mostly comprised of a metal like NiFe) is typically surrounded by non-magnetic material (e.g. alumina). This can cause charging of the ABS surface and create uncertainty at the nanometer scale that can be reduced with the addition of a non-magnetic metal.

    An ideal pole tip would be formed on a roughly planar surface where an addi...