title: Collective spin waves in high-density two-dimensional arrays of FeCo nanowires.
abstract: Brillouin measurements have been made of the spin dynamics of high-density two-dimensional hexagonally ordered 20 nm diameter Fe48Co52 nanowire arrays, with various interwire spacings, as a function of longitudinal magnetic field. The experimental data are analyzed within the Arias-Mills theory based on interwire dipolar couplings in the arrays. The results provide conclusive evidence of collective spin waves arising from the dipolar coupling which is manifested as a reduction in spin wave frequency with decreasing interwire spacing.
authors.affiliation: Department of Physics, National University of Singapore, Singapore 117542, Singapore.
authors.forename: Zhi Kui
authors.initials: ZK
authors.lastname: Wang
authors.forename: Hock Siah
authors.initials: HS
authors.lastname: Lim
authors.forename: Vanessa Li
authors.initials: VL
authors.lastname: Zhang
authors.forename: Jia Li
authors.initials: JL
authors.lastname: Goh
authors.forename: Ser Choon
authors.initials: SC
authors.lastname: Ng
authors.forename: Meng Hau
authors.initials: MH
authors.lastname: Kuok
authors.forename: Hai Lin
authors.initials: HL
authors.lastname: Su
authors.forename: Shao Long
authors.initials: SL
authors.lastname: Tang
mesh_terms: D003035:Cobalt / Q000032:analysis / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D017097:Electric Impedance; D004559:Electric Wiring / Q000295:instrumentation*; D058085:Iron Compounds / Q000032:analysis / Q000737:chemistry*; D008280:Magnetics; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D013113:Spin Labels
chemical_list: D058085:Iron Compounds; D013113:Spin Labels; D003035:Cobalt