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Decoherence and mode hopping in a magnetic tunnel junction based spin torque oscillator
P K Muduli1, O G Heinonen, Johan Akerman
1Physics Department, University of Gothenburg, 41296 Gothenburg, Sweden.
Abstract:
We discuss the coherence of magnetic oscillations in a magnetic tunnel junction based spin torque oscillator as a function of the external field angle. Time-frequency analysis shows mode hopping between distinct oscillator modes, which arises from linear and nonlinear couplings in the Landau-Lifshitz-Gilbert equation, analogous to mode hopping observed in semiconductor ring lasers. These couplings and, therefore, mode hopping are minimized near the current threshold for the antiparallel alignment of free-layer with reference layer magnetization. Away from the antiparallel alignment, mode hopping limits oscillator coherence.
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