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The time domain stability of microwave spin torque oscillators (STOs) hasbeen investigated by systematic micromagnetic simulations. A model based oninternal spin wave reflection at grain boundaries with reduced exchangecoupling was implemented and used to study the oscillator under quasi-stableoperating conditions. Telegraphic mode jumping between two operatingfrequencies (23.3 and 24.1 GHz) was observed in the time domain withcharacteristic dwell times in the range of 10-100 ns. The oscillating volumewas shown to have a different shape at the distinct operating frequencies. Theshape difference is governed by spin wave reflections at the grain boundaries.The resulting non-linear behavior of the oscillator was shown to be acollective effect of spin wave scattering at different locations within a fewspin wavelengths from the nano-contact.

Micromagnetic Modeling of Telegraphic Mode Jumping in Microwave Spin Torque Oscillators