Slow-wave based magnonic diode

Abstract

Spin waves, the collective excitations of the magnetic order parameter, and magnons, the associated quasiparticles, are envisioned as possible data carriers in future wave-based computing architectures. On the road towards spin-wave computing, the development of a diode-like device capable of transmitting spin waves in only one direction, thus allowing controlled signal routing, is an essential step. Here, we report on the design and experimental realization of a microstructured magnonic diode in a ferromagnetic bilayer system. Effective unidirectional propagation of spin waves is achieved by taking advantage of nonreciprocities produced by dynamic dipolar interactions in transversally magnetized media, which lack symmetry about their horizontal midplane. More specifically, dipolar-induced nonreciprocities are used to engineer the spin-wave dispersion relation of the bilayer system so that the group velocity is reduced to very low values for one direction of propagation, and not for the other, thus producing unidirectional slow spin waves. Brillouin light scattering and propagating spin-wave spectroscopy are used to demonstrate the diode-like behavior of the device, the composition of which was previously optimized through micromagnetic simulations. simulations.

13 pages, 7 figures

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• Magnonic band structure in CoFeB/Ta/NiFe meander-shaped magnetic bilayers
• Fully Resonant Magneto-elastic Spin-wave Excitation by Surface Acoustic Waves under Conservation of Energy and Linear Momentum
• Unidirectionality of spin waves in Synthetic Antiferromagnets
• Nonreciprocal spin-wave dispersion in magnetic bilayers
• Temperature-sensitive spin-wave nonreciprocity induced by interlayer dipolar coupling in ferromagnet/X (X=paramagnet, superconductor) hybrid systems
• Electromagnetic Proximity Effect: Superconducting Magnonics and Beyond
• Multifunctional operation of the double-layer ferromagnetic structure coupled by a rectangular nanoresonator
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• Three-dimensional nanoscale control of magnetism in crystalline Yttrium Iron Garnet
• Nonreciprocal collective magnetostatic wave modes in geometrically asymmetric bilayer structure with nonmagnetic spacer
• Nonreciprocal Spin Waves Driven by Left-Hand Microwaves
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