Patent ID: 8227099

Claim:
A radio-frequency oscillator that includes a magnetoresistive device in which a spin-polarised electric current flows, said device comprising a stack of at least: a first magnetic layer that is an anchored layer having a fixed magnetisation direction that is oriented in the plane of the first magnetic layer; a second magnetic layer consisting of a synthetic antiferromagnetic layer; an amagnetic layer that is positioned between the first magnetic layer and the second magnetic layer that functions as a spacer and ensures magnetic decoupling of the first magnetic layer and the second magnetic layer; and means of causing a flow of electrons in said layers perpendicular to these layers and, if applicable, of applying an external magnetic field to the structure, wherein the second magnetic layer has a Gilbert damping factor at least 10% greater than the Gilbert damping factor measured in a simple layer of the same material having the same geometry for magnetic excitation having wavelengths equal to or less than the extent of the cone or cylinder of current that flows through the stack that constitutes the magnetoresistive device.