4.8 Article

Controlling Magnon Interaction by a Nanoscale Switch

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 17, Pages 20288-20295

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c01562

Keywords

spin wave; magnon interaction; spin torque; magnetic tunnel junction; stray field; magnetic neuromorphic systems; hybrid quantum systems

Funding

  1. National Science Foundation [DMR-1610146, EFMA-1641989, ECCS-1708885]
  2. National Research Foundation of Ukraine [2020.02/0261]
  3. Army Research Office [W911NF-16-1-0472]

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The ability to control and tune magnetic dissipation is crucial for emerging spintronic technologies, with magnon scattering processes being a major channel for dissipation in nanomagnets. This study proposes a method for controlling magnon scattering by generating a nonuniform magnetic field at the nanoscale. Experimental demonstrations in magnetic tunnel junction nanodevices show potential for tuning nonlinearities in magnetic neuromorphic applications and engineering coherent magnon coupling in hybrid quantum information technologies.
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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