High-Frequency Vortex-Based Spin Transfer Nano-Oscillators

Spin transfer torque oscillators based on magnetic vortex precession can deliver output powers large enough for practical applications. In addition they do not require discrete electronic components, such as capacitors or inductors, to tune the oscillation frequency. At the current stage, this oscillation frequency is still too low and can be increased only by trading off the output power. Here, we present our experimental results on nanocontact oscillators, which are, amongst the spintronic oscillators, those that can deliver the largest power. Based on the analysis of our experimental results, we propose a new device geometry and numerically demonstrate that an increase of the frequency, up to a useful range for practical applications, can be obtained without trading off output power.