Manipulation Of Nonlinear Magnon Effects Using A Secondary Microwave Frequency

With minimal Joule loss, magnetic insulator-based quantized spin-waves or magnons are becoming increasingly popular for device applications including logic-circuits and signal processing. The parametric excitation-based nonlinear behavior that plays an important role in such applications is also interesting from a physics perspective. In this work, we demonstrate quantitative prediction of the threshold microwave-field needed for initiating nonlinear behavior in the presence of a secondary microwave frequency. This would allow the in situ control of non-linearity and, hence, prove to be useful for a wide range of applications, especially those involving microwave devices. The fine structures, appearing in the threshold-field upon variation in the frequency of the secondary frequency, have been demonstrated using simulations and explained analytically. The impact of the magnon phase relative to the pump is also quantitatively determined.