Influence of the vertex region on spin dynamics in artificial Kagome spin ice.

Journal Article · Mon Jul 27 00:00:00 EDT 2020 · Physical Review Applied

DOI:https://doi.org/10.1103/PhysRevApplied.14.014079· OSTI ID:1779044

Bang, Wonbae; Sturm, James; Silvani, Raffaele; Kaffash, Mojtaba T.; Hoffmann, Axel; Ketterson, John B.; Montoncello, Federico; Jungfleisch, M. Benjamin

We present experimental and theoretical studies of spin-wave mode dynamics in artificial kagome spin ice vertices made of three identical 15-nm thick elongated Ni80Fe20 nanoislands (macrospins). We consider several possible configurations, from completely disjointed macrospins (full dipolar interelement interac-tions) to fully jointed macrospins (full dipolar-exchange interactions). Using angular-resolved magnetic field dependent broadband ferromagnetic resonance (FMR), we demonstrate the occurrence of a mode localized in the vertex region as indicated by the distinct behavior of the FMR spectra at different angles and configurations. Theoretical calculations using micromagnetic simulations support the existence, ori-gin, and behavior of this mode by interpreting it as a localized, quasi-uniform Kittel mode. Our findings pave the way for designing the most appropriate network consisting of ferromagnetic nanomagnets for specific application purposes in magnonics.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; National Science Foundation (NSF); USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1779044
• Journal Information: Physical Review Applied, Vol. 14, Issue 1
• Country of Publication: United States
• Language: English