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Strong interplay between ferroelectric and magnetic orders in novel complex oxides

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TitleInfo
Title
Strong interplay between ferroelectric and magnetic orders in novel complex oxides
Name (type = personal)
NamePart (type = family)
Lee
NamePart (type = given)
Nara
NamePart (type = date)
1979-
DisplayForm
Nara Lee
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Cheong
NamePart (type = given)
Sang-Wook
DisplayForm
Sang-Wook Cheong
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
chair
Name (type = personal)
NamePart (type = family)
Oh
NamePart (type = given)
Seongshik
DisplayForm
Seongshik Oh
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Yuzbashyan
NamePart (type = given)
Emil
DisplayForm
Emil Yuzbashyan
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Hinch
NamePart (type = given)
Jane
DisplayForm
Jane Hinch
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Sirenko
NamePart (type = given)
Andrei
DisplayForm
Andrei Sirenko
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
outside member
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
Graduate School - New Brunswick
Role
RoleTerm (authority = RULIB)
school
TypeOfResource
Text
Genre (authority = marcgt)
theses
OriginInfo
DateCreated (qualifier = exact)
2012
DateOther (qualifier = exact); (type = degree)
2012-05
CopyrightDate (qualifier = exact)
2012
Place
PlaceTerm (type = code)
xx
Language
LanguageTerm (authority = ISO639-2b); (type = code)
eng
Abstract (type = abstract)
Multiferroics, where ferroelectric and magnetic orders are concurrently present, reveal new physical properties due to the strong interplay between the dual order parameters. The emergence of the unprecedented cross-coupling effects in such materials has offered a new vein of essential understanding of correlated spin and lattice degrees of freedom and the related macroscopic phenomena, and has invigorated the application in future generations of novel devices. Recently, the enhanced coupling has been discovered in the new class of materials called spin-driven ferroelectrics in which ferroelectric order originates from the exchange striction of special types of magnetic orders with broken inversion symmetry. However, the driven ferroelectric polarization appears to be minuscule, compared with that of the typical ferroelectrics. Thus, one of the demanding challenges of the multiferroics research is finding systems or ways to escalate the magnitude of polarization. Herein, we present discoveries of new multiferroics which exhibit giant ferroelectricity due to the new exchange striction mechanism through rare-earth and transition-metal ions and their strong tunability of polarization by applying magnetic fields. (1) New multiferroic of single-crystalline orthorhombic HoMnO3 was, for the first time, grown by the flux method. The crystals with incommensurate E-type magnetic structure exhibit much large ferroelectric polarization with the direction along the c-axis, completely different from the theoretical predictions. From the analysis, the polarization can be described by the new emerging mechanism of Ho-Mn exchange striction. (3) Tunable giant ferroelecric polarization in the multiferroic GdMn2O5 has been demonstrated. The ferroelectric polarization in this compound is found to be the largest and be varied repeatedly with the largest change by applying external magnetic fields among the spin-driven ferroelectrics known to date. In addition, contrary to the known origin for ferroelectricity in REMn2O5 (RE=rare earth ions), the Mn-Mn exchange striction mechanism, the complete magnetic structure constructed by the x-ray resonant scattering experiment clarify that the giant ferroelectricity in GdMn2O5 results mainly from the Gd-Mn symmetric exchange striction.
Subject (authority = RUETD)
Topic
Physics and Astronomy
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_3833
PhysicalDescription
Form (authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
vi, 121 p. : ill.
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Note (type = vita)
Includes vita
Note (type = statement of responsibility)
by Nara Lee
Subject (authority = ETD-LCSH)
Topic
Oxides
Subject (authority = ETD-LCSH)
Topic
Ferromagnetic materials
Identifier (type = hdl)
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000065192
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Location
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NjNbRU
Identifier (type = doi)
doi:10.7282/T3CN72VR
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

RightsDeclaration (ID = rulibRdec0006)
The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Lee
GivenName
Nara
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2012-02-09 15:44:34
AssociatedEntity
Name
Nara Lee
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
AssociatedObject
Type
License
Name
Author Agreement License
Detail
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.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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