Hard disk drive with write gap conductive structure and dual independent interface voltage control circuitry
US10650850B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2019 |
| Grant date | May 12, 2020 |
| Priority date | — |
| Expiry date | Jun 11, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0024
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A hard disk drive has a gas-bearing slider supporting a write head with an electrically conductive structure, like a spin-torque oscillator (STO), in the write gap, and dual independent interface voltage control (IVC) circuitry coupled to elements on the slider. A first IVC circuitry provides a bias voltage to the slider body to assure substantially zero electrical potential between the slider body and the disk to minimize slider-disk contact and lubrication pick-up. A second IVC circuitry operates independently of the first IVC circuitry and provides a bias voltage to the electrically conductive structure region to assure a negative potential of the electrically conductive structure region relative to the disk to minimize degradation of the slider overcoat and thus oxidation of the electrically conductive structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.