Enhanced signal-to-noise ratio in magnonic logic gates via dipole coupling

Abstract

This work presents a significant advancement in spin-wave computing devices utilizing magnetostatic surface spin waves. We demonstrate a micro-Y-shaped waveguide fabricated from yttrium iron garnet with a nanometer thickness. This intricately engineered design enables a novel logic device with two inputs and one output, enabling future cascading of such elements. Electrical measurements on the Y-shaped structure reveal that strategically introduced gaps effectively manipulate spin-wave propagation, as corroborated by detailed micromagnetic simulations. Notably, we achieve robust diagonal spin-wave transmission across 1.2 µm gaps, covering a distance of 120 µm. Furthermore, the gapped device exhibits clear phase-dependent spin-wave interference, surpassing the performance of a conventional Y-shaped design. This phenomenon, confirmed by mapping simulated magnetization components, signifies the potential of dipole-coupled devices for realizing efficient 2-input-1-output magnonic logic elements, laying the groundwork for future development in this field.