Seeded Growth of Ferrite Nanoparticles from Mn oxides : Observation of Anomalies in Magnetic Transitions

Handle URI:
http://hdl.handle.net/10754/558454
Title:
Seeded Growth of Ferrite Nanoparticles from Mn oxides : Observation of Anomalies in Magnetic Transitions
Authors:
Song, Hyon-Min; Zink, Jeffrey I.; Khashab, Niveen M. ( 0000-0003-2728-0666 )
Abstract:
A series of magnetically active ferrite nanoparticles (NPs) are prepared by using Mn oxide NPs as seeds. Verwey transition is identified in Fe3O4 NPs with an average diameter of 14.5 nm at 96 K, where a sharp drop of magnetic susceptibility occurs. In MnFe2O4 NPs, spin glass-like state is observed with the decrease of magnetization below the blocking temperature due to the disordered spins during the freezing process. From these MnFe2O4 NPs, MnFe2O4@MnxFe1-xO core-shell NPs are prepared by seeded growth. The structure of core is cubic spinels (Fd-3m), and shell is composed of iron-manganese oxide (MnxFe1-xO) with a rock salt structure (Fm-3m). Moiré fringes appear perpendicular to <110> directions on the cubic shape NPs through the plane-matched epitaxial growth. These fringes are due to the difference in their lattice spacings between MnFe2O4 and MnxFe1-xO. Exchange bias is observed in these MnFe2O4@MnxFe1-xO core-shell NPs with an enhanced coercivity as well as the shift of hysteresis along the field direction.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Advanced Membranes and Porous Materials Research Center
Citation:
Seeded Growth of Ferrite Nanoparticles from Mn oxides : Observation of Anomalies in Magnetic Transitions 2015 Phys. Chem. Chem. Phys.
Publisher:
Royal Society of Chemistry (RSC)
Journal:
Phys. Chem. Chem. Phys.
Issue Date:
17-Jun-2015
DOI:
10.1039/C5CP01301A
Type:
Article
ISSN:
1463-9076; 1463-9084
Additional Links:
http://pubs.rsc.org/en/Content/ArticleLanding/2015/CP/C5CP01301A
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorSong, Hyon-Minen
dc.contributor.authorZink, Jeffrey I.en
dc.contributor.authorKhashab, Niveen M.en
dc.date.accessioned2015-06-23T12:54:12Zen
dc.date.available2015-06-23T12:54:12Zen
dc.date.issued2015-06-17en
dc.identifier.citationSeeded Growth of Ferrite Nanoparticles from Mn oxides : Observation of Anomalies in Magnetic Transitions 2015 Phys. Chem. Chem. Phys.en
dc.identifier.issn1463-9076en
dc.identifier.issn1463-9084en
dc.identifier.doi10.1039/C5CP01301Aen
dc.identifier.urihttp://hdl.handle.net/10754/558454en
dc.description.abstractA series of magnetically active ferrite nanoparticles (NPs) are prepared by using Mn oxide NPs as seeds. Verwey transition is identified in Fe3O4 NPs with an average diameter of 14.5 nm at 96 K, where a sharp drop of magnetic susceptibility occurs. In MnFe2O4 NPs, spin glass-like state is observed with the decrease of magnetization below the blocking temperature due to the disordered spins during the freezing process. From these MnFe2O4 NPs, MnFe2O4@MnxFe1-xO core-shell NPs are prepared by seeded growth. The structure of core is cubic spinels (Fd-3m), and shell is composed of iron-manganese oxide (MnxFe1-xO) with a rock salt structure (Fm-3m). Moiré fringes appear perpendicular to <110> directions on the cubic shape NPs through the plane-matched epitaxial growth. These fringes are due to the difference in their lattice spacings between MnFe2O4 and MnxFe1-xO. Exchange bias is observed in these MnFe2O4@MnxFe1-xO core-shell NPs with an enhanced coercivity as well as the shift of hysteresis along the field direction.en
dc.publisherRoyal Society of Chemistry (RSC)en
dc.relation.urlhttp://pubs.rsc.org/en/Content/ArticleLanding/2015/CP/C5CP01301Aen
dc.rightsArchived with thanks to Phys. Chem. Chem. Phys.en
dc.titleSeeded Growth of Ferrite Nanoparticles from Mn oxides : Observation of Anomalies in Magnetic Transitionsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.identifier.journalPhys. Chem. Chem. Phys.en
dc.eprint.versionPost-printen
dc.contributor.institutionDepartment of Chemistry, Dong'A University, Busan 604'7 14, South Koreaen
dc.contributor.institutionDepartment of Chemistry and Biochemistry, University of California, Los Angeles, California 90095'1569, United Statesen
kaust.authorSong, Hyon Minen
kaust.authorKhashab, Niveen M.en
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