期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.207203
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资金
- Swedish Foundation for Strategic Research (SSF)
- Swedish Research Council (VR)
- Knut and Alice Wallenberg foundation (KAW)
- VR
- UChicago Argonne, LLC [DE-AC02-06CH11357]
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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