Controlling Multimagnon Interaction in Magnetic Nanodots and Spintronic Nanostructures

Variety of nonlinear processes is a prominent feature of ferromagnetic materials, which has already become a basis for many technological applications. In magnetic nanodots and spintronic nanostructures, nonlinear dynamics could be more rich and important than in bulk samples and thin films. In particular, at the nanoscale new efficient driving mechanisms can be employed, allowing to excite magnetic nanostructures into a strongly nonlinear high-amplitude state. In this chapter, we present recent advances in static and dynamic control of nonlinear three- and four-magnon processes, as well as theoretical approach for the investigation of these processes. We cover different methods of nonlinearity control, starting from a standard detuning from the resonance condition and including more involved methods relying on spatial symmetry breaking and hybridization of spin-wave modes. The presented results can serve as a guide to analyze magnon processes inherently present in spintronic devices for boosting their performance or to engineer a specific nonlinear response of a nanomagnet used in neuromorphic, magnonic, or other application.