Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/16137
Title: Magnetic mesostructures
Authors: WANG JUN
Keywords: MFM, magnetostatic interaction, mesostructure, ring, magnetization reversal behavior, in-situ MFM
Issue Date: 17-Apr-2007
Source: WANG JUN (2007-04-17). Magnetic mesostructures. ScholarBank@NUS Repository.
Abstract: The magnetic properties of ferromagnetic mesostructures are currently attracting increasing interest both from a fundamental viewpoint and their potential applications in magnetic random access memory. We investigate the effect of magnetostatic interactions and magnetization reversal path in arrays of ferromagnetic patterned mesostructures using both ex-situ and in-situ field magnetic force microcopy. We have successfully recorded the transitions from onion-to-vortex and vortex-to-reverse onion magnetic states for patterned Ni80Fe20 rings using ex-situ field measurements, and found that the transitions are strongly dependent on the ring packing density due to dipolar magnetostatic interaction. For the in-situ MFM measurements, the magnetic domain evolution during the magnetization reversal process for the Cobalt ring and anti-ring arrays has been systematically studied. It was found that the magnetization switching behavior is markedly modified by the film thickness and element spacing. The results have been further verified by the micromagnetic simulations, which agree well with the experimental results.
URI: http://scholarbank.nus.edu.sg/handle/10635/16137
Appears in Collections:Master's Theses (Open)

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