[21p-W241-1~21] 10.2 Spin torque, spin current, circuits, and measurement technologies

▼ [21p-W241-17] Electrical mutual synchronization in vortex spin torque oscillators

〇Sumito Tsunegi¹, Hitoshi Kubota¹, Kay Yakushiji¹, Akio Fukushima¹, Shinji Yuasa¹ (1.AIST)

Keywords:Spin torque oscillator,Mutual synchronization

Self-oscillation of the magnetization in a spin torque oscillator (STO) has been extensively studied with the aim of being applied in practical device such as nano size high frequency generator. For the purpose to increase emission power, applying synchronized STO array system was proposed as one of the possible candidates. In the STO array, it is necessary to synchronize the phase of STOs. In this work, we report the results obtained for electrical mutual synchronization of vortex-STO and the improvement achieved in emission power.
We prepared three circular shaped STOs. The rf power of STO_A, STO_B and STO_C were 1.0 μW, 0.67 μW and 0.74 μW, respectively. The rf power increases by increasing the number of STOs. This result evidently shows the achievement obtained by mutual synchronization and is the first report of emission-power enhancement using electrical mutual synchronization.