Despite extensive research on magnetic skyrmions and antiskyrmions,a significant challenge remains in crafting nontrivial high-order skyrmionic textures with varying,or even tailor-made,topologies.We address this chal...Despite extensive research on magnetic skyrmions and antiskyrmions,a significant challenge remains in crafting nontrivial high-order skyrmionic textures with varying,or even tailor-made,topologies.We address this challenge,by focusing on a construction pathway of skyrmionic metamaterials within a monolayer thin film and suggest several skyrmionic metamaterials that are surprisingly stable,i.e.,long-lived,due to a self-stabilization mechanism.This makes these new textures promising for applications.Central to our approach is the concept of’simulated controlled assembly’,in short,a protocol inspired by’click chemistry’that allows for positioning topological magnetic structures where one likes,and then allowing for energy minimization to elucidate the stability.Utilizing high-throughput atomistic-spin-dynamic simulations alongside state-of-the-art AI-driven tools,we have isolated skyrmions(topological charge Q=1),antiskyrmions(Q=−1),and skyrmionium(Q=0).These entities serve as foundational’skyrmionic building blocks’to form the here-reported intricate textures.In this work,two key contributions are introduced to the field of skyrmionic systems.First,we present a novel combination of atomistic spin dynamics simulations and controlled assembly protocols for the stabilization and investigation of new topological magnets.Second,using the aforementioned methods we report on the discovery of skyrmionic metamaterials.展开更多
We develop a multiscale approach to magnetoelectric effects,bridging atomistic and continuum models,with all parameters determined from ab initio electronic structure calculations.We show that the parameters of the mo...We develop a multiscale approach to magnetoelectric effects,bridging atomistic and continuum models,with all parameters determined from ab initio electronic structure calculations.We show that the parameters of the model are equivalent to the electric field-induced Dzyaloshinski-Moriya interactions.After careful validation,we apply the models to study electric polarization and dipole moments carried by spin spirals and topological solitons,in the form of magnetic domain walls and Skyrmions,in the prototypical 2D magnet CrI3.We show that the reduced symmetry of the material leads to additional magnetoelectric coupling terms,dominating over those expected in high symmetry(cubic)materials.An interesting consequence is that Skyrmions carry an out-of-plane electric dipole moment,while that of anti-Skyrmions is an order of magnitude larger and in-plane.Finally,we discuss the possibility to stabilize non-collinear spin states using electric fields.展开更多
基金support from the Swedish Research Council(grant numbers VR 2016-05980,VR 2019-05304,2022-04720,and 2023-04239)the Knut and Alice Wallenberg Foundation(grant numbers 2018.0060,2021.0246,and 2022.0108)is acknowledged.A.D.and O.E.acknowledge support from the Wallenberg Initiative Materials Science for Sustainability(WISE),funded by the Knut and Alice Wallenberg Foundation(KAW).Q.X.acknowledges financial support from the China Scholarship Council(201906920083)+5 种基金I.P.M.acknowledges support from the Crafoord Foundation(Grant No.20231063)A.E.acknowledges financial support fromÅForsk(22-441)the Göran Gustafsson Foundation.A.B.and O.E acknowledges support from eSSENCEThe computations were enabled by resources provided by theNational Academic Infrastructure for Supercomputing in Sweden(NAISS)the Swedish National Infrastructure for Computing(SNIC)at NSC and PDC,partially funded by the Swedish Research Council through grant agreements No.2022-06725 and no.2018-05973GPU resources are provided by KAW(Berzelius-2022-141).
文摘Despite extensive research on magnetic skyrmions and antiskyrmions,a significant challenge remains in crafting nontrivial high-order skyrmionic textures with varying,or even tailor-made,topologies.We address this challenge,by focusing on a construction pathway of skyrmionic metamaterials within a monolayer thin film and suggest several skyrmionic metamaterials that are surprisingly stable,i.e.,long-lived,due to a self-stabilization mechanism.This makes these new textures promising for applications.Central to our approach is the concept of’simulated controlled assembly’,in short,a protocol inspired by’click chemistry’that allows for positioning topological magnetic structures where one likes,and then allowing for energy minimization to elucidate the stability.Utilizing high-throughput atomistic-spin-dynamic simulations alongside state-of-the-art AI-driven tools,we have isolated skyrmions(topological charge Q=1),antiskyrmions(Q=−1),and skyrmionium(Q=0).These entities serve as foundational’skyrmionic building blocks’to form the here-reported intricate textures.In this work,two key contributions are introduced to the field of skyrmionic systems.First,we present a novel combination of atomistic spin dynamics simulations and controlled assembly protocols for the stabilization and investigation of new topological magnets.Second,using the aforementioned methods we report on the discovery of skyrmionic metamaterials.
基金support from the Swedish Research Council(VR-2018-06807 and 2022-04720),ÅForsk(22-441),the Göran Gustafsson Foundation,and the Swedish e-Science Research Center(SeRC)M.S.acknowledges the support of the State Investigation Agency through the Severo Ochoa Program for Centres of Excellence in R&D(CEX2023-001263-S),of the Ministry of Science,Innovation and Universities(Grant No.PID2023-152710NB-I00)+1 种基金of Generalitat de Catalunya(Grant No.2021 SGR 01519)This work has been funded by the European Union-NextGenerationEU,under the Italian Ministry of University and Research(MUR)PRIN-2022 project"SORBET:Spin-ORBit Effects in Two-dimensional magnets"(IT-MIUR Grant No.2022ZY8HJY)and National Innovation Ecosystem grant ECS00000041-VITALITY-CUP B43C22000470005.Computational work was done on resources at PDC,Stockholm,and NSC,Linköping,via the National Academic Infrastructure for Supercomputing in Sweden(NAISS),as well as the Galileo system of Cineca through HPC-Europa3(HPC17A3WLE),which also supported the collaborative effort by funding an international research visit.
文摘We develop a multiscale approach to magnetoelectric effects,bridging atomistic and continuum models,with all parameters determined from ab initio electronic structure calculations.We show that the parameters of the model are equivalent to the electric field-induced Dzyaloshinski-Moriya interactions.After careful validation,we apply the models to study electric polarization and dipole moments carried by spin spirals and topological solitons,in the form of magnetic domain walls and Skyrmions,in the prototypical 2D magnet CrI3.We show that the reduced symmetry of the material leads to additional magnetoelectric coupling terms,dominating over those expected in high symmetry(cubic)materials.An interesting consequence is that Skyrmions carry an out-of-plane electric dipole moment,while that of anti-Skyrmions is an order of magnitude larger and in-plane.Finally,we discuss the possibility to stabilize non-collinear spin states using electric fields.
