Western Digital (Fremont), Inc.

Nurul Amin

Steven C Rudy

Changqing Shi

Yufeng Hu

Mark D Moravec

Luc Chung

Eric R McKie

Neil David Knutson

Systems and methods for using NFT disc test structures for controlling NFT disc length during manufacture of an HAMR writer are disclosed. An NFT is manufactured concurrently with one or more pairs of pin-disc and disc-less test structures. The NFT disc and pin dimensions may be substantially similar to the pin and disc dimensions of the pin-disc test structure. The disc length of the pin-disc test structure is measured as a function of the difference in resistance between the two test structures and other parameters. Capturing the disc length variation subsequently enables adjustment of the NFT electronic lapping guide stripe height to reduce length variation in the NFT pin.

Test structures for measuring near field transducer disc length

A slider bar apparatus, and a method for lapping a back side surface of the slider bar, is provided. The slider bar includes a head part and a pair of sliders separated by the head part. Each of the sliders has an air bearing surface (ABS) and a back side surface opposite the ABS. Each of the sliders has a reader element and a writer element of a magnetic head for use in a magnetic hard disk drive. An electrical lapping guide is mounted on the back side surface and has a pair of terminals and a conductive material extending between the terminals. The conductive material is arranged on the slider bar such that the resistance between the terminals increases during a lapping of the back side of the sliders.

Electrical lapping guide for dimensional control of back side of heat assisted magnetic recording device

A system for providing transducer(s) including a disk structure and having an air-bearing surface (ABS) are described. The disk structure resides a distance from the ABS and has a disk dimension substantially perpendicular to the ABS. Lapping control and disk windage ELGs are provided. The lapping control ELG has first and second edges first and second distances from the ABS. The disk windage ELG has edges different distances from the ABS. A difference between these edges corresponds to the disk dimension. A windage resistance of the disk windage ELG is measured and a disk windage determined. The disk windage corresponds to a difference between designed and actual disk dimensions perpendicular to the ABS. A lapping ELG target resistance is determined based on the disk windage. The transducer is lapped. Lapping is terminated based on a resistance of the lapping control ELG and the lapping ELG target resistance.

System for adjusting lapping of a transducer using a disk windage

A method and system for providing transducer(s) including a disk structure and having an air-bearing surface (ABS) are described. The disk structure resides a distance from the ABS and has a disk dimension substantially perpendicular to the ABS. Lapping control and disk windage ELGs are provided. The lapping control ELG has first and second edges first and second distances from the ABS. The disk windage ELG has edges different distances from the ABS. A difference between these edges corresponds to the disk dimension. A windage resistance of the disk windage ELG is measured and a disk windage determined. The disk windage corresponds to a difference between designed and actual disk dimensions perpendicular to the ABS. A lapping ELG target resistance is determined based on the disk windage. The transducer is lapped. Lapping is terminated based on a resistance of the lapping control ELG and the lapping ELG target resistance.

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Fremont, CA, United States of America

Nurul Amin