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OukJae Lee 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.2
We present a coherent spin-torque nano-oscillator (STNO) with spectral linewidths ≤ 10 MHz based on a nanopillar spin-valve device in which an in-plane magnetic free layer (FL) is excited by a combined out-of-plane and in-plane spin-polarized current under external magnetic fields, approximately cancelling the average in-plane dipolar field. The STNO exhibits enhanced nonlinear effective damping ($\Gamma_{eff}$) in the coherent region, resulting from the torque competition from the two spin polarizers and the spatial variation of the anti-damping effectiveness. This effectively reduces the nonlinear coupling ($v$) between the amplitude and the phase fluctuations.