The
ability to control and tune magnetic dissipation is a key concept
of emergent spintronic technologies. Magnon scattering processes constitute
a major dissipation channel in nanomagnets, redefine their response
to spin torque, and hold the promise for manipulating magnetic states
on the quantum level. Controlling these processes in nanomagnets,
while being imperative for spintronic applications, has remained difficult
to achieve. Here, we propose an approach for controlling magnon scattering
by a switch that generates nonuniform magnetic field at nanoscale.
We provide an experimental demonstration in magnetic tunnel junction
nanodevices, consisting of a free layer and a synthetic antiferromagnet.
By triggering the spin-flop transition in the synthetic antiferromagnet
and utilizing its stray field, magnon interaction in the free layer
is toggled. The results open up avenues for tuning nonlinearities
in magnetic neuromorphic applications and for engineering coherent
magnon coupling in hybrid quantum information technologies.
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