Magnetic memory including a recording device and medium that can be magnetized vertically
US4742413A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1986 |
| Grant date | May 3, 1988 |
| Priority date | — |
| Expiry date | Dec 15, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic memory comprising a thin-film magnetic head as well as a recording medium which is provided with a storage layer that can be magnetized perpendicularly (vertically). The magnetic head comprises two magnet legs having a magnetic layer each, the magnetic poles of which are arranged in tandem, forming a gap therebetween. With this magnetic head, a write and read function with high efficiency is obtained. It is provided for this purpose that at least one magnetic layer of the trailing magnet leg differs at least in its end region with respect to its magnetic behavior (magnetic resistance; saturation magnetization) from the at least one magnetic layer of the leading magnet leg at least in its end region, and that the coercivity of the material of the storage layer of the recording medium is chosen sufficiently high, so that overwriting of the storage layer of the recording medium by the trailing magnet leg is, at least largely, eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.