Magnon scattering enables non-linear microwave devices, such as frequency selective limiters and signal to noise enhancers. It may also impact information transfer within spintronic devices. Here, a quantitative understanding of magnon processes in thin films is developed using micromagnetic simulations, in combination with newly developed analytic theory and experimental data. A technique for calculating the number of magnons at each frequency and wavevector as a function of external input such as power and frequency is identified. It is shown that, near the nonlinear threshold, the dominant parametrically excited magnon pairs are those with minimal group velocity and the correct energy. These results complement Brillouin Light Scattering experiments and indicate a path for wavevector-modulated magnon production based only on simulated results and/or analytic theory, a desirable goal for information transfer and communication.
Bibliographical noteFunding Information:
This work was supported in part by DARPA M3IC Program under Grant W911NF-17-1-0100, in part by the Center for Micromagnetics and Information Technologies (MINT), in part by SMART, in part by SRC NCore Center sponsored by NIST, in part by NSF through the Extreme Science and Engineering Discovery Environment (XSEDE) under Grant ACI-1548562.
- Magnetic films
- microwave magnetics
- nonlinear microwave absorption