Infrared nanoimaging of hydrogenated perovskite nickelate synaptic devices, S. Gamage, S. Manna, M. Zajac, S. Hancock, Q. Wang, S. Singh, M. Ghafariasl, K. Yao, T. Tiwald, T. J. Park, D. P. Landau, H. Wen, S.K.R.S. Sankaranarayanan, P. Darancet, S. Ramanathan and Y. Abate, ACS Nano, 18, 2105 (2024)