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 microwavefield 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.
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This work was supported by the U.S. Defense Advanced Research Projects Agency (DARPA) under Grant No. W911NF-17-1-0100 and by the Center for Micromagnetics and Information Technologies (MINT). This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which was supported by NSF Grant No. ACI-1548562. XSEDE GPU P100 nodes at Comet and Bridges were used through the allocation No. TG-ECS200001. The authors also acknowledge the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for providing resources that contributed to the research results reported within this paper.
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