Ordered Hybrid Metamaterial of La0.7Sr0.3MnO3-Au Vertically Aligned Nanocomposites Achieved on Templated SrTiO3 Substrate

Abstract Coupled multifunctionalities in nanocomposite thin films offer a pathway towards future integration of device applications. The oxide-metal two-phase nanocomposite thin films in a vertically aligned-nanocomposite (VAN) morphology allow for unique structural control and functionality tuning towards future nanoscale devices. However, achieving in-plane ordering of the two phases remains challenging. In this work, we demonstrate an initial success of in-plane long-range ordering achieved in a new oxide-metal VAN system, La0.7Sr0.3MnO3(LSMO)-Au, through annealed SrTiO3(STO) substrates. The combination of plasmonic Au and ferromagnetic LSMO enables multifunctionalities, including opto-magneto coupling, hyperbolic dispersion, and tunable ferromagnetic anisotropy. Beyond this LSMO-Au VAN system demonstrated in this work, the long-range ordered two-phase structures induced by perovskite substrate surface terraces can be applied to other oxide-metal VAN systems.