Magnetic studies of colossal magnetoresistance materials and FePt nanocrystals


Magnetic studies of colossal magnetoresistance materials and FePt nanocrystals

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dc.contributor.advisor Lozanne, Alejandro L. de
dc.creator Hyun, Changbae, 1974- 2008-08-28T23:58:18Z 2008-08-28T23:58:18Z 2007-12 2008-08-28T23:58:18Z
dc.description.abstract This dissertation introduces scanning probe microscopy (SPM) and describes the construction and design of a home built low temperature magnetic force microscope (MFM). Then the magnetic coatings on atomic force microscope cantilevers with a focused ion beam (FIB) will be explained. This technique allows the convenient deposition of complex or expensive materials such as CoCrPt. With the MFM tip coated by FIB, the ferromagnetic domain structure of a La[subscript 0.67]Ca[subscript 0.33]MnO₃ film is studied as a function of an in-plane magnetic field below room temperature. Next I will discuss the use of chemically-synthesized FePt nanocrystals as a good candidate for high density storage media. This nanocrystal film showed sintering problems during the annealing process, which is essential to make FePt a hard ferromagnet. A silica overcoating method was used to prevent nanocrystal sintering, which allowed the MFM study of films made from these nanocrystals. I will also discuss resistance measurements of the FePt nanocrystals.
dc.format.medium electronic
dc.language.iso eng
dc.rights Copyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.
dc.subject.lcsh Scanning probe microscopy
dc.subject.lcsh Nanocrystals
dc.title Magnetic studies of colossal magnetoresistance materials and FePt nanocrystals
dc.description.department Physics
dc.identifier.oclc 194451983
dc.identifier.recnum b6970563x
dc.type.genre Thesis
dc.type.material text Physics Physics The University of Texas at Austin Doctoral Doctor of Philosophy

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