System, method and apparatus for strain-assisted magnetic recording for controlling switching field and tightening switching field distribution in bit patterned media
US8129043B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2009 |
| Grant date | Mar 6, 2012 |
| Priority date | — |
| Expiry date | Dec 3, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Multilayer magnetic structures control the switching field and tighten the switching field distribution in bit patterned media. A strain-inducing layer is excited, e.g., by a localized magnetic field or a localized thermal heating or a voltage, and induces a strain on the magnetic layer(s) of the patterned bit to initiate switching of the bit magnetization. The strain induced on the magnetic layer forces a rotation or an amplitude variation of the magnetic layer anisotropy. A localized magnetic field is simultaneously or subsequently applied to complete the switching of the bit magnetization. The invention provides control of switching field and switching field distribution for bit-patterned media devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.