Large microwave generation from d.c. driven magnetic vortex oscillators in magnetic tunnel junctions

Abstract

Spin polarized current can excite the magnetization of a ferromagnet through the transfer of spin angular momentum to the local spin system. This pure spin-related transport phenomena leads to alluring possibilities for the achievement of a nanometer scale, CMOS compatible and tunable microwave generator operating at low bias for future wireless communications. Microwave emission generated by the persitent motion of magnetic vortices induced by spin transfer effect seems to be a unique manner to reach appropriate spectral linewidth. However, in metallic systems, where such vortex oscillations have been observed, the resulting microwave power is much too small. Here we present experimental evidences of spin-transfer induced core vortex precessions in MgO-based magnetic tunnel junctions with similar good spectral quality but an emitted power at least one order of magnitude stronger. More importantly, unlike to others spin transfer excitations, the thorough comparison between experimental results and models provide a clear textbook illustration of the mechanisms of vortex precessions induced by spin transfer.

References in corpus (9)

• Bias-driven large power microwave emission from MgO-based tunnel magnetoresistance devices
• Current-driven vortex oscillations in metallic nanocontacts
• Coupling efficiency for phase locking of a spin transfer oscillator to a microwave current
• Bistability of vortex core dynamics in a single perpendicularly magnetized nano-disk
• Impact of the electrical connection of N Spin Transfer Oscillators on their synchronization : an analytical study
• Dynamics of Pinned Magnetic Vortices
• Excitation of spin dynamics by spin-polarized current in vortex state disks
• Non-uniformity of a planar polarizer as a reason of spin-transfer induced vortex oscillations at zero field
• Critical velocity for the vortex core reversal in perpendicular bias magnetic field

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