Defect-sensitive high-frequency modes in a three-dimensional artificial magnetic crystal
Cheenikundil, Rajgowrav; d'Aquino, Massimiliano; Hertel, Riccardo (2025-10-06)
Springer
06.10.2025
Cheenikundil, R., d’Aquino, M. & Hertel, R. Defect-sensitive high-frequency modes in a three-dimensional artificial magnetic crystal. npj Comput Mater 11, 297 (2025). https://doi.org/10.1038/s41524-025-01784-2
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https://creativecommons.org/licenses/by/4.0/
© The Author(s) 2025. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202510166340
https://urn.fi/URN:NBN:fi:oulu-202510166340
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Abstract
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 system displays 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.
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 system displays 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.
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