Nonlocal detection of interlayer three-magnon coupling

Abstract

A leading nonlinear effect in magnonics is the interaction that splits a high-frequency magnon into two low-frequency ones with conserved linear momentum. Here, we report experimental observation of nonlocal three-magnon scattering between spatially separated magnetic systems, viz. a CoFeB nanowire and an yttrium iron garnet (YIG) thin film. Above a certain threshold power of an applied microwave field, a CoFeB Kittel magnon splits into a pair of counter-propagating YIG magnons that induce voltage signals in Pt electrodes on each side, in excellent agreement with model calculations based on the interlayer dipolar interaction. The excited YIG magnon pairs reside mainly in the first excited (n=1) perpdendicular standing spin-wave mode. With increasing power, the n=1 magnons successively scatter into nodeless (n=0) magnons through a four-magnon process. Our results help to assess non-local scattering processes in magnonic circuits that may enable quantum entanglement between distant magnons for quantum information applications.

References in corpus (6)

• Ground-to-satellite quantum teleportation
• Hybrid magnonics: physics, circuits and applications for coherent information processing
• Resources of nonlinear cavity magnonics for quantum information
• Controlled nonlinear magnetic damping in spin-Hall nano-devices
• Measurement of the dynamical dipolar coupling in a pair of magnetic nano-disks using a Ferromagnetic Resonance Force Microscope
• Nonlinear losses in magnon transport due to four-magnon scattering

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• Magnon-magnon interaction induced by nonlinear spin wave dynamics
• Spin waves involved in three-magnon splitting in synthetic antiferromagnets
• Observation of Dyakonov-Perel-type magnon spin relaxation in uniaxial antiferromagnetic insulators