Project Details
Projekt
Magnetic skyrmions-bubble hybrids in nanolayers of metallic ferromagnets: interplay of the magnetodipolar and Dzyaloshinskii-Moriya interactions
Applicant
Professor Dr. Alexei N. Bogdanov
Subject Area
Theoretical Condensed Matter Physics
Experimental Condensed Matter Physics
Experimental Condensed Matter Physics
Term
from 2018 to 2023
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 403039150
Axisymmetric solitons stabilized by intrinsic and/or induced Dzyaloshinskii-Moriya (DM) interactions (chiral skyrmions) and common cylindrical magnetic domains (bubbles) stabilized by surface demagnetization effects are two fundamentally different types of topologically non-trivial magnetic structures observed in recently synthesized nanolayers and multilayer stacks of magnetic compounds. They contain areas of reversed magnetization localized in spots of the nano- to microscale size and thus are considered as promising objects for novel types of magnetic data storage and other applications in emerging spin electronics. Recently, a different kind of localized magnetic patterns – formed under the combined influence of chiral DM and magnetodipolar interactions – has been observed in many types of nanolayers. These specific localized states represent intermediate objects between "pure" chiral skyrmions found in nanolayers of non-centrosymmetric ferromagnets and classical bubble domains arising in ferromagnetic films with strong perpendicular anisotropy. These structures can be considered as "skyrmion-bubble hybrids" exhibiting properties attributed both to chiral skyrmions and magnetic domains. Within this project we shall develop a theory of corresponding localized and modulated states arising in recently synthesized nanomagnetic systems with moderate or weak perpendicular anisotropy and intrinsic and/or induced chiral modulations due to the DM interaction. Analytical theoretical research will be combined with domain observation using high-resolution magneto-optical Kerr microscopy and full-scale advanced micromagnetic simulations. Based on our theoretical and experimental findings we intend to create a comprehensive physical description of the bubble-skyrmion states arising in modern nanomagnetic materials with intrinsic and induced chiral interactions.
DFG Programme
Priority Programmes
