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Smear removal/mitigation by approaching head disk proximity

IP.com Disclosure Number: IPCOM000246812D
Publication Date: 2016-Jul-01
Document File: 2 page(s) / 56K

Publishing Venue

The IP.com Prior Art Database

Abstract

A program is disclosed that smear (also called material buildup) on the head of heat assisted magnetic recording (HAMR) system can be removed and mitigated by supplying power to thermal fly-height control (TFC) along or magnetic writer and TFC both to make head approach disk proximity.

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Smear removal/mitigation by approaching head disk proximity

Shaomin Xiong, Dongbo Li, Na Wang, Qing Dai

A program is disclosed that smear (also called material buildup) on the head of heat assisted magnetic recording (HAMR) system can be removed and mitigated by supplying power to thermal fly-height control (TFC) along or magnetic writer and TFC both to make head approach disk proximity.

Smear is consistently generated and accumulated in the head disk interface (HDI) for HAMR systems. Smear fills the gap between the near field transducer (NFT) and disk in a time frame of tens of seconds to hundreds of seconds. Once smear fills the gap, it contacts and interacts with the disk, which could result in instability of head disk interface. One simple example is that the touchdown power is significantly changed when a lot of smear fills the head disk gap. Smear could also change the NFT coupling and heat transfer between the NFT and disk, such that the head recording performance could be changed. In order to maintain the head disk interface stability and minimize the recording performance changes, it is very critical to develop a method to remove or mitigate the smear. As smear grows with writing time, it is preferred to remove it at its initial stage to avoid smear and disk contact and interaction. Furthermore, the volume of smear at the initial stage is relatively smaller and allows it to be removed easily by a writer touchdown or TFC touchdown. During the writer or TFC touchdown, the writer and NFT area approaches and touches the disk surface, the smear around the writer and NFT will be burnished away. However, too much touchdowns could lead to potential material wear or performance degradation of the head. Therefore, it is better to make the writer/NFT approach the disk surface rather than touching the disk. The minimum point on the head is kept a couple of Angstrom away from the disk surface during the approaching process. This approaching process needs to be performed regularly after a writing duration of tens or hun...