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An epitaxial NbN–Co VAN thin film was deposited on a MgO substrate with a cubic NbN phase, which presents ferromagnet properties with strong out-of-plane magnetic anisotropy. This hybrid metamaterial could find future applications in device design. 

The unique redox properties and high oxygen capacity of nanostructured CeO₂demonstrate a wide range of applications, such as electrolytes for solid oxide fuel cells, gas sensors, and catalysis for automotive exhaust gas. Most CeO₂nanomaterials are prepared by chemical synthesis or hard templating methods. An effective way to obtain highly textured, small‐radius dimensions with high specific surface area remains challenging. Here, highly textured CeO₂nanostructures with various shapes ranging from nanowires to nanoporous thin films are successfully synthesized. Vertically aligned nanocomposites (VANs) of Sr₃Al₂O₆(SAO) and CeO₂are synthesized first while varying concentration ratio between them. Once the SAO is dissolved in water, the remaining CeO₂forms distinct nanostructures. The thermal stability of the nanostructured CeO₂is evaluated byin situheating XRD and thermal annealing tests. This method provides an alternative approach to preparing nanostructured CeO₂without toxic chemical solutions or complex micro/nanofabrication techniques. These results present a novel approach to prepare nanostructured CeO₂for future sensing and energy device applications.