Write current and media heater control for heat or microwave assisted magnetic recording
US9070397B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2014 |
| Grant date | Jun 30, 2015 |
| Priority date | — |
| Expiry date | May 8, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0024
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data storage device and method for improved flying height control (TFC) in a HAMR or MAMR system employing three heat sources to control the head protrusion: write coil current, TFC heater current, and media exciter power. The TFC heater is used to pre-heat the write head. The media exciter may be operated at a either a zero level or a low level below that required for the HAMR or MAMR process, optionally serving as an additional source of heat to the write head. The HAMR or MAMR data writing process commences only after the head protrusion has been increased and stabilized. During data writing, the media exciter power is increased to the higher level required to heat the disk medium in an HAMR or MAMR process and the TFC heater power is slightly reduced to maintain the total heat into the head approximately constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.