Patent ID: 9576635
Date: 2017-02-21
CPC Classifications: G11C

Claim:
1. Thermally-assisted magnetic writing device comprising at least one magnetic element including: a first magnetic layer, the first magnetic layer having a stable vortex magnetisation configuration; a magnetic field creating device to create a magnetic field to reversibly move a vortex core in a plane of said first magnetic layer; a second magnetic layer, the second magnetic layer having a variable magnetisation configuration; a non-magnetic spacer that separates and magnetically decouples the first magnetic layer and the second magnetic layer; an antiferromagnetic pinning layer in contact with the second magnetic layer, the antiferromagnetic layer being capable of pinning the magnetisation configuration of the second magnetic layer, said second magnetic layer having at least two storage levels corresponding to two pinned magnetisation configurations, and a heating device to heat said antiferromagnetic pinning layer such that when heated, the temperature of said antiferromagnetic pinning layer exceeds its blocking temperature such that the magnetisation configuration of said second magnetic layer is no longer pinned when warm, wherein the second magnetic layer has a stable vortex magnetisation configuration.