Dual-pulse excitation method for ultra-fast, super-resolution all-optical magnetic recording
US11790943B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 2020 |
| Grant date | Oct 17, 2023 |
| Priority date | — |
| Expiry date | Apr 30, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B13/045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A dual-pulse excitation method for ultra-fast, super-resolution all-optical magnetic recording includes the steps of: providing a first excitation pulse and a second modulation pulse; and focusing the first excitation pulse and the second modulation pulse, and then radiating the two pulses in sequence to a magneto-optical recording medium, so that an area of the magneto-optical recording medium irradiated undergoes opto-magnetic reversal. By controlling the time delay, spatial overlapping area, and energy density ratio between the dual femtosecond laser pulses, it can induce a second reversal of the magnetization field in the spatial overlapping area of the two pulses on the magneto-optical material that can achieve single-pulse opto-magnetic reversal to obtain all-optical magnetic recording beyond the diffraction limit. This process takes place within several hundred picoseconds, thus providing an effective technical means for ultra-high density and ultra-fast magnetic storage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.