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Parametric excitation of magnetic vortex gyrations in spin-torque nano-oscillators

机译:自旋转矩纳米振荡器中磁涡旋的参量激励

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摘要

We experimentally demonstrate that large amplitude magnetic vortex gyrations can be parametrically excited by the injection of radio-frequency (rf) current at twice the natural frequency of the gyrotropic vortex-core motion. The mechanism of excitation is based on the parallel pumping of vortex motion by the rf orthoradial field generated by the injected current. Theoretical analysis shows that experimental results can be interpreted as the manifestation of parametric amplification when the rf current is small, and of parametric instability when the rf current is above a certain threshold. By taking into account the energy nonlinearities, we succeed to describe the amplitude saturation of vortex oscillations as well as the coexistence of stable regimes.
机译:我们实验证明,可以通过以两倍于回旋涡核运动固有频率的频率注入射频(rf)电流来大幅度激发大振幅磁涡旋。激励机制是基于由注入电流产生的rf正交辐射场对涡旋运动的平行泵激。理论分析表明,当射频电流较小时,实验结果可以解释为参数放大的表现;当射频电流大于一定阈值时,则可以解释为参数不稳定的表现。通过考虑能量非线性,我们成功地描述了涡旋振荡的振幅饱和以及稳定状态的共存。

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