Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/27646
Title: Brillouin scattering investigation of nanomagnetic structures
Authors: WANG ZHIKUI
Keywords: Spin dynamics, nanostructure, Brillouin Light scattering, spin waves, nanomagnetism, ferromagnetism
Issue Date: 11-Aug-2008
Source: WANG ZHIKUI (2008-08-11). Brillouin scattering investigation of nanomagnetic structures. ScholarBank@NUS Repository.
Abstract: Brillouin light scattering is employed to study the dynamical properties of arrays of vertical ferromagnetic nanowires and nanorings, which show great promise as high-density magnetic storage and sensor devices. Three closely related projects are reported: (1) observation of bulk magnon quantization in Ni nanowires: bulk spin wave quantization has been observed, and the magnon frequencies are found to decrease with increasing wire diameter. (2) investigation into the magnetic interaction between FeCo nanowires in closely-packed arrays: 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 is found, and (3) study of the spin dynamics of large-aspect-ratio Ni nanorings: spin dynamics of high-aspect-ratio Ni nanorings is found to compare well with macroscopic theory. Micromagnetic simulations show that, for low applied magnetic fields, the nanorings undergo a transition from a b bamboob to b twisted bamboob magnetic state.
URI: http://scholarbank.nus.edu.sg/handle/10635/27646
Appears in Collections:Ph.D Theses (Open)

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