biostudies-literatureUnknownMishra KDutch Research Council (NWO)Svenska Forskningsr?det FormasH2020 Future and Emerging TechnologiesKnut och Alice Wallenbergs StiftelseSwedish Foundation for International Cooperation in Research and Higher EducationEuropean Cooperation in Science and TechnologyVetenskapsr?detMagnetic memory combining plasmonics and magnetism is poised to dramatically increase the bit density and energy efficiency of light-assisted ultrafast magnetic storage, thanks to nanoplasmon-driven enhancement and confinement of light. Here we devise a new path for that, simultaneously enabling light-driven bit downscaling, reduction of the required energy for magnetic memory writing, and a subtle control over the degree of demagnetization in a magnetophotonic surface crystal. It features a regular array of truncated-nanocone-shaped Au-TbCo antennas showing both localized plasmon and surface lattice resonance modes. The ultrafast magnetization dynamics of the nanoantennas show a 3-fold resonant enhancement of the demagnetization efficiency. The degree of demagnetization is further tuned by activating surface lattice modes. This reveals a platform where ultrafast demagnetization is localized at the nanoscale and its extent can be controlled at will, rendering it multistate and potentially opening up so-far-unforeseen nanomagnetic neuromorphic-like systems operating at femtosecond time scales controlled by light.Nano lettershttps://www.ebi.ac.uk/biostudies/studies/S-EPMC9756331biostudies-literatureUltrafast Demagnetization Control in Magnetophotonic Surface Crystals.PMC97563312015.0060KO2016-68892019-035812017-04828CA171232021-01390737093Kapaklis VCiuciulkaite AKimel AVRowan-Robinson RMKirilyuk ADavies CSDmitriev AMishra KfalseUltrafast Demagnetization Control in Magnetophotonic Surface Crystals.Magnetic memory combining plasmonics and magnetism is poised to dramatically increase the bit density and energy efficiency of light-assisted ultrafast magnetic storage, thanks to nanoplasmon-driven enhancement and confinement of light. Here we devise a new path for that, simultaneously enabling light-driven bit downscaling, reduction of the required energy for magnetic memory writing, and a subtle control over the degree of demagnetization in a magnetophotonic surface crystal. It features a regular array of truncated-nanocone-shaped Au-TbCo antennas showing both localized plasmon and surface lattice resonance modes. The ultrafast magnetization dynamics of the nanoantennas show a 3-fold resonant enhancement of the demagnetization efficiency. The degree of demagnetization is further tuned by activating surface lattice modes. This reveals a platform where ultrafast demagnetization is localized at the nanoscale and its extent can be controlled at will, rendering it multistate and potentially opening up so-far-unforeseen nanomagnetic neuromorphic-like systems operating at femtosecond time scales controlled by light.2022-01-01T00:00:00Z2022 Nov2025-04-04T08:55:45.922Z2025-04-04T08:55:45.922ZS-EPMC97563313632169010.1021/acs.nanolett.2c00769