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technical paper
Cooperative growth of macrospin and vortex chains in Artificial Spin Vortex Ice nanomagnetic arrays
The frustrated interactions in nanomagnetic arrays can lead to the emergence of complex behaviour. Here we consider nanomagnets with dimensions on the crossover from single ferromagnetic domain (macrospin) and vortex states 1-3, in both ordered and disordered array geometries. Magnetic force microscopy reveals that there is a ratchet-like transformation of macrospins into vortices, during minor loop magnetic reversals. Simulations show that interactions with neighbouring magnets play an important role, giving cooperative growth of macrospin and vortex chains. This gradual evolution of linkages is neuromorphic in character, and interesting for both neurally-inspired computation 1 and self-assembly of magnonic circuits3.
References:
1Gartside, Jack C., et al. "Reconfigurable Training and Reservoir Computing via Spin-Wave Fingerprinting in an Artificial Spin-Vortex Ice." Nature Nanotechnology (2022) 2Gartside, Jack C., et al. "Reconfigurable magnonic mode-hybridisation and spectral control in a bicomponent artificial spin ice." Nature Communications 12.1 (2021): 1-9. 3Stenning, Kilian D., et al. "Magnonic bending, phase shifting and interferometry in a 2d reconfigurable nanodisk crystal." ACS nano 15.1 (2020): 674-685.