Abstract
A previous theoretical model of 3-magnon scattering is connected to experimentally measured characteristics, such as the damping constant α and the power threshold, through a realistic micromagnetic simulation. Both the critical magnon amplitude and relaxation rate are determined to be proportional to α which implies that the power threshold scales sensitively as α <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> . In addition, the scattered magnons are found to form two sets of symmetric wavevector <bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">k</b> <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">≠</i> 0 magnon pairs, which are focused over a small range of angles and robust for a wide power range. Our results increase understanding of the model with respect to experimental and engineering aspects, and reduce the trial and error approach to application design.
Highlights
Nonlinear microwave devices based on magnons are of great interest, benefiting from low power consumption, simple implementation, and size miniaturization, all compared to their electrical counterparts [1]–[4]
MAGNON SCATTERING AT VARYING DAMPING CONSTANT We find that the damping constant determines the elliptical magnon amplitude b0 at wavevector k = 0, when magnonmagnon scattering exists in the system
The k = 0 magnon amplitude remains at a constant critical amplitude bcr once magnon scattering is activated in the system
Summary
Nonlinear microwave devices based on magnons are of great interest, benefiting from low power consumption, simple implementation, and size miniaturization, all compared to their electrical counterparts [1]–[4]. The models present the critical amplitude, an indirect approach to the nonlinear response, while the characteristics commonly used in microwave applications are the power threshold and the nonlinear susceptibility. This distinction poses a difficulty to the design of a successful device. An extensive simulation sheds light on the correlation between the model factors, the damping constant α, and the important microwave characteristics. This clarification reduces the trial and error approach to optimizing the design of nonlinear microwave devices.
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