Patent · US Expired

Method for magnetic recording on patterned multilevel perpendicular media using thermal assistance and fixed write current

US6865044B1 · kind B1 · utility

31Cited by
15References
6Claims
0Family size

Assignee

Inventors

Key dates

Filing dateDec 3, 2003
Grant dateMar 8, 2005
Priority date
Expiry dateDec 3, 2023

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG11B2005/0021
  • WIPO fieldAudio-visual technology
  • WIPO sectorElectrical engineering

Abstract

A method for magnetic recording uses a fixed write current with thermal assistance to record on a patterned perpendicular magnetic recording medium. The patterned medium has magnetic blocks or islands, each of which contains a stack of individual magnetic cells to provide multilevel recording. Each cell in an island is formed of a material or set of materials to provide the cell with perpendicular magnetic anisotropy and is a single magnetic domain. Each cell is magnetically decoupled from the other cells in its island by nonmagnetic spacer layers. Thus each cell can have a magnetization (magnetic moment) in one of two directions (into or out of the plane of the layer making up the cell), and this magnetization is independent of the magnetization of the other cells in its island. This permits multiple magnetic levels or states to be recorded in each magnetic island.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.