Ultra-large mutually synchronized networks of 10 nm spin Hall nano-oscillators

Nilamani Behera; Avinash Kumar Chaurasiya; Akash Kumar; Roman Khymyn; Artem Litvinenko; Lakhan Bainsla; Ahmad A. Awad; Johan Åkerman

arXiv · 2501.18321

Ultra-large mutually synchronized networks of 10 nm spin Hall nano-oscillators

Nilamani Behera·Avinash Kumar Chaurasiya·Akash Kumar·Roman Khymyn·Artem Litvinenko·Lakhan Bainsla·Ahmad A. Awad·Johan Åkerman

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Abstract

While mutually interacting spin Hall nano-oscillators (SHNOs) hold great promise for wireless communication, neural networks, neuromorphic computing, and Ising machines, the highest number of synchronized SHNOs remains limited to $N$ = 64. Using ultra-narrow 10 and 20-nm nano-constrictions in W-Ta/CoFeB/MgO trilayers, we demonstrate mutually synchronized SHNO networks of up to $N$ = 105,000. The microwave power and quality factor scale as $N$ with new record values of 9 nW and $1.04 \times 10^6$, respectively. An unexpectedly strong array size dependence of the frequency-current tunability is explained by magnon exchange between nano-constrictions and magnon losses at the array edges, further corroborated by micromagnetic simulations and Brillouin light scattering microscopy. Our results represent a significant step towards viable SHNO network applications in wireless communication and unconventional computing.

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Nilamani Behera, Avinash Kumar Chaurasiya, Akash Kumar, Roman Khymyn, Artem Litvinenko, Lakhan Bainsla, Ahmad A. Awad, Johan Åkerman. 2025-01-30. Ultra-large mutually synchronized networks of 10 nm spin Hall nano-oscillators. https://arxiv.org/abs/2501.18321

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