RADIO-FREQUENCY OSCILLATOR WITH SPIN-POLARISED ELECTRIC CURRENT

摘要

This radio-frequency oscillator includes a magnetoresistive device in which a spin-polarised electric current flows. This device comprises a stack of at least: a first so-called "anchored" magnetic layer (1) having a fixed magnetisation direction, a second magnetic layer (2), an amagnetic layer (3) inserted between the above-mentioned two layers, intended to ensure magnetic decoupling of said layers. The oscillator also comprises 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. The second magnetic layer (2) has an excitation damping factor at least 10% greater than the damping 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.