Modern three-dimensional nanofabrication methods make it possible to generate arbitrarily shaped nanomagnets,including periodic networks of interconnected magnetic nanowires.Structurally similar to optical or acoustic...Modern three-dimensional nanofabrication methods make it possible to generate arbitrarily shaped nanomagnets,including periodic networks of interconnected magnetic nanowires.Structurally similar to optical or acoustic metamaterials,these arrays could represent magnetic variants of such artificial materials.Using micromagnetic simulations,we investigate a three-dimensional array of interconnected magnetic nanowires with intersection points corresponding to atomic positions of a diamond lattice.The high-frequency excitation spectrum of this artificial magnetic crystal(AMC)is shaped by both microstructure and magnetization configuration.The systemdisplays characteristics of three-dimensional artificial spin ice and can host Dirac-type magnetic defect structures,which are associated with characteristic magnonic frequencies.We demonstrate how magnetic configurations and structural defects affect the spectrum and show that external magnetic fields allow continuous tuning of the overall frequency response.While our study focuses on fundamental aspects,the findings suggest AMCs may serve as reconfigurable magnonic media for future magnonic or neuromorphic devices.展开更多
基金funded by the LabEx NIE (ANR-11-LABX-0058_NIE) in the framework of the Interdisciplinary Thematic Institute QMat (ANR-17-EURE-0024), as part of the ITI 2021-2028 program supported by the IdEx Unistra (ANR-10-IDEX-0002-002) and SFRI STRATUS (ANR-20-SFRI-0012) through the French Program d'Investissement d’Avenirfunded by the France 2030 government investment plan managed by the French National Research Agency ANR under grant reference PEPR SPIN—[SPINTHEORY] ANR-22-EXSP-0009.The authors acknowledge the High Performance Computing Center of the University of Strasbourg for supporting this work by providing access to computing resources.
文摘Modern three-dimensional nanofabrication methods make it possible to generate arbitrarily shaped nanomagnets,including periodic networks of interconnected magnetic nanowires.Structurally similar to optical or acoustic metamaterials,these arrays could represent magnetic variants of such artificial materials.Using micromagnetic simulations,we investigate a three-dimensional array of interconnected magnetic nanowires with intersection points corresponding to atomic positions of a diamond lattice.The high-frequency excitation spectrum of this artificial magnetic crystal(AMC)is shaped by both microstructure and magnetization configuration.The systemdisplays characteristics of three-dimensional artificial spin ice and can host Dirac-type magnetic defect structures,which are associated with characteristic magnonic frequencies.We demonstrate how magnetic configurations and structural defects affect the spectrum and show that external magnetic fields allow continuous tuning of the overall frequency response.While our study focuses on fundamental aspects,the findings suggest AMCs may serve as reconfigurable magnonic media for future magnonic or neuromorphic devices.
