Grain structure influence on synchronized two-dimensional spin-Hall nano-oscillators

Nanoconstriction spin-Hall nano-oscillators (NC-SHNOs) are excellent devices for a wide variety of applications, from RF communication to bio-inspired computing. NC-SHNOs easy fabricate in large arrays, CMOS compatible, and feature narrow linewidth high output power. However, order take full advantage the device capabilities, systematic analysis array behavior with respect number dimensions oscillators, temperature operation, influence layer quality is needed. Here, we focus on micromagnetic simulations 2 × 4 NC-SHNO arrays single oscillators separated by up 300 nm. We observe synchronization scheme that allows column-wise selection oscillation frequency larger pitch. smaller pitches, coherent volume was observed, this included both constrictions extended beyond region. A local variation exchange coupling active oscillator region investigated placing physical grains free magnetic layer, it shown stable current range resulting De-coupling along rows or columns could provide higher power due more favorable phase shifts between oscillators. Our investigation helps achieving deeper understanding intrinsic working principles how they reach fully synchronized states, will help expand non-conventional computing capabilities.