Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/15565
Title: Brillouin scattering study of magnons in magnetic nanostructures
Authors: LIU HAIYAN
Keywords: Brillouin, magnetic, nanostructure, nanowire, nanoring, bilayers.
Issue Date: 24-Nov-2006
Source: LIU HAIYAN (2006-11-24). Brillouin scattering study of magnons in magnetic nanostructures. ScholarBank@NUS Repository.
Abstract: The spin dynamics of three different magnetic nanostructures, permalloy nanowires, nickel nanorings and Co/CoPt bilayers, have been studied using Brillouin spectroscopy. Spin waves in hexagonal permalloy nanowire arrays have been investigated and the interactions between wires are analyzed using the Arias-Mills theory on collective spin waves in 2-D nanowire arrays. A comparison of results from arrays of nanowires with those from a single nanowire indicates that the magnetic interaction between neighboring nanowires is negligible. 3-D micromagnetic simulations have been performed on high-aspect-ratio Ni nanorings to study the magnetization distributions and spin waves in the ring structure. Simulations show that as the field decreases from saturation, the rings switch from a bamboo to a twisted bamboo state at a certain critical field. The simulated spin wave frequencies agree with those from Brillouin experiments. Brillouin scattering has been used to study the Co/CoPt exchange spring bilayers. The magnetic field dependence of the spin wave frequency was obtained. The experimental data compare well with those based on a semi-classical model. The results in this thesis provide important information on the magnetic coupling, anisotropy, and magnetization switching in magnetic nanostructures.
URI: http://scholarbank.nus.edu.sg/handle/10635/15565
Appears in Collections:Ph.D Theses (Open)

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