Abstract
Spin-torque excited ferromagnetic resonance (ST-FMR) performed in nanoscale devices can be used to characterize material properties and optimize spintronic devices for applications. In this paper, micromagnetic simulation is employed to study the FMR property in a nano-ring shaped magnetic tunnel junction. The simulation predictions are confirmed by experiments, revealing that two resonance states (mode-1 and mode-2) with different resonance frequencies are excited by a microwave frequency current or magnetic field. The relatively weak response signal of FMR at the negative field can be attributed to the intrinsic asymmetric structure of magnetic tunnel junctions, which leads to a bias-dependent asymmetric spin transfer torque. Besides, high-order harmonics with two and three times the fundamental frequencies of the mode-1 and mode-2 are also observed.
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