Decoherence and mode-hopping in a magnetic tunnel junction-based spin-torque oscillator

Abstract

We discuss the coherence of magnetic oscillations in a magnetic tunnel junction-based spin-torque oscillator as a function of 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 antiparallel (AP) alignment of free layer with reference layer magnetization. Away from the AP alignment, mode-hopping limits oscillator coherence.

To appear in Phys. Rev. Lett. Note the paper accompany Suppl info

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Cited by in corpus (20)

• Spin wave mode coexistence on the nano-scale: A consequence of the Oersted field induced asymmetric energy landscape
• Power and linewidth of propagating and localized modes in nanocontact spin-torque oscillators
• Frequency shift keying by current modulation in a MTJ-based STNO with high data rate
• Mapping out the spin-wave modes of constriction-based spin Hall nano-oscillators in weak in-plane fields
• Generation linewidth of mode-hopping spin torque oscillators
• Temperature dependence of linewidth in nano-contact based spin torque oscillators: effect of multiple oscillatory modes
• Interface moment dynamics and its contribution to spin-transfer torque switching process in magnetic tunnel junctions
• Chiral skyrmion auto-oscillations in a ferromagnet under spin transfer torque
• Temperature dependence of the emission linewidth in MgO-based spin torque nano-oscillators
• Thermo-magnonic diode: rectification of energy and magnetization currents
• Time-domain stability of parametric synchronization in a spin-torque nano-oscillator based on a magnetic tunnel junction
• Improved spectral stability in spin transfer nano-oscillators: single vortex versus coupled vortices dynamics
• Time Domain Mapping of Spin Torque Oscillator Effective Energy
• Tunable mode coupling in nano-contact spin torque oscillators
• Origin of Nonlinear Damping due to Mode Coupling in Auto-Oscillatory Modes Strongly Driven by Spin-Orbit Torque
• Theory of nonreciprocal spin waves excitation in spin-Hall oscillators with Dzyaloshinkii-Moriya interaction
• Influence of interlayer coupling on the spin torque driven excitations in a spin torque oscillator
• Driven energy transfer between coupled modes in spin-torque oscillators
• Nanocontact vortex oscillators based on Co${}_2$MnGe pseudo-spin valves
• Current-driven magnetization dynamics and their correlation with magnetization configurations in perpendicularly magnetized tunnel junctions