Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/35217
Title: SPIN WAVES IN MAGNETIC NANOSTRUCTURES
Authors: LIN CHENG SHENG
Keywords: spin wave, magnon, magnonic crystal, nanomagnet, patterned magnetic media, ferromagnet
Issue Date: 30-Mar-2012
Source: LIN CHENG SHENG (2012-03-30). SPIN WAVES IN MAGNETIC NANOSTRUCTURES. ScholarBank@NUS Repository.
Abstract: This PhD thesis comprises timely theoretical studies on spin waves (SWs) in various patterned magnetic structures. Magnonic crystals (MCs), artificial crystals of periodically modulated magnetic and geometric properties, are of technological importance as they exhibit bandgaps for spin waves similar to what photonic crystals do for electromagnetic waves. A particular example is a one-dimensional array comprising submicron-wide stripes made of two alternating ferromagnetic materials. This bi-component MC exhibits two reprogrammable ground states, namely the ferromagnetic (FM) and antiferromagnetic (AFM) states, which can be exploited for novel functionalities of potential devices based on the MC. In this thesis, I study the SW modes in such bi-component MCs in both their FM and AFM states, with the objective of investigating how the geometric and magnetic properties of these crystals affect their frequency bandgaps. Employing the Spin Wave Well model, I also investigate the localization phenomenon of SWs in a ferromagnetic triangular nanomagnet.
URI: http://scholarbank.nus.edu.sg/handle/10635/35217
Appears in Collections:Ph.D Theses (Open)

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