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Nano-self-assembly in Mn-based spinels through solid state process
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Title
Nano-self-assembly in Mn-based spinels through solid state process
Identifier
ETD_1228
Identifier
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000050458
Language
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eng
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theses
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Topic
Physics and Astronomy
Subject
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(authority = ETD-LCSH)
Topic
Manganese
Subject
(ID = SBJ-1);
(authority = ETD-LCSH)
Topic
Spinel group
Abstract
Transition-metal oxides characterized with anisotropic d-orbital electrons are subject to intense discussion in strongly correlated electron systems, ranging from colossal magnetoresistance (CMR) to high temperature superconductivity (HTSC). The orbital degree of freedom often underpins complex physical properties and a variety of extraordinary phenomena while coupling with charge, spin and lattice. In this thesis, we demonstrate a fascinating example of orbital-related physical properties in Mn-based spinels. The strong octahedral preference of Jahn-Teller ions Mn3+ results in simultaneous chemical and structural phase separation into Mn-poor (cubic) and Mn-rich (tetragonal) regions, forming two types of rectangular nanorods with cross section checkerboard-like (CB). Because of the pioneering discovery of checkerboards in the nonmagnetic ZnMnxGa1-xO4, we chose to study two magnetic spinel systems: (1) Mg(MnxFe1-x)O4, where unfortunately only poorly-ordered magnetic nano CBs were observed; and (2) Mn-doped CoFe2O4, the nano CBs with distinct magnetic properties and tunable sizes achieved here are highly ordered, exhibiting a nearly ideal architecture for the patterned perpendicular recording medium. The evolution of such compositional separation and topological nanoscale ordering is reasonably understood based on a three dimensional (3D) phase-field microelasticity (PFM) model.
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xii, 94 p. : ill.
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Ph.D.
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Includes bibliographical references.
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by Chenglin Zhang
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Zhang
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Chenglin
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1977-
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Chenglin Zhang
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Cheong
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Sang-Wook
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chair
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Sang-Wook Cheong
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Paul
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Paul L Leath
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Williams
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Theodore
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Theodore Williams
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Chandra
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Premala
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Premala Chandra
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Zhou
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Tao
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Advisory Committee
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Tao Zhou
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Rutgers University
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Graduate School - New Brunswick
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2008
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2008-10
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xx
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NjNbRU
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Rutgers University Electronic Theses and Dissertations
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ETD
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Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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doi:10.7282/T3SX6DJZ
Genre
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ETD doctoral
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The author owns the copyright to this work.
Copyright
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Open
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Non-exclusive ETD license
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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