Magnetic data storage using induced strain of a magnetostrictive material
US9489973B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2014 |
| Grant date | Nov 8, 2016 |
| Priority date | — |
| Expiry date | Feb 13, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Acoustically assisted magnetic recording can be used in a hard disk drive or a solid state medium. In the described embodiments, otherwise unwriteable high-coercivity media are made amenable to recording by lowering their coercivity via strain induced by acoustic waves. The use of acoustic waves temporarily and locally reduces the magnetic field required to record information on a magnetic recording medium. The process makes use of the magnetostrictive property of a magnetic material by which the magnetic anisotropy of the material is changed by strain. The result of such a change is a reduction in the coercive field, i.e., the magnetic field required to reverse the magnetization direction. Because acoustic waves cause strain, the passage of an acoustic wave through a magnetic material can be used to reduce its coercive field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.