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Spin-wave propagation in alpha-Fe2O3 nanorods: the effect of confinement and disorder

Cortie, David; Casillas-Garcia, Gilberto; Squires, Andrew; Mole, Richard; Wang, Xiaolin; Liu, Yun; Chen, Yen-Hua; Yu, Dehong

Description

Spin-wave excitations in α-Fe2O3 nanorods were directly detected using time-of-flight inelastic neutron spectroscopy. The dispersive magnon features are compared with those in bulk α-Fe2O3 particles at various temperatures to highlight differences in mode intensity and width. The interchanged spectral intensities in the nanorod are a consequence of a suppressed spin orientation, and this is also evident in the neutron diffraction which demonstates that the weak ferromagnetic phase survives to...[Show more]

dc.contributor.authorCortie, David
dc.contributor.authorCasillas-Garcia, Gilberto
dc.contributor.authorSquires, Andrew
dc.contributor.authorMole, Richard
dc.contributor.authorWang, Xiaolin
dc.contributor.authorLiu, Yun
dc.contributor.authorChen, Yen-Hua
dc.contributor.authorYu, Dehong
dc.date.accessioned2020-02-14T01:59:39Z
dc.identifier.issn0953-8984
dc.identifier.urihttp://hdl.handle.net/1885/201698
dc.description.abstractSpin-wave excitations in α-Fe2O3 nanorods were directly detected using time-of-flight inelastic neutron spectroscopy. The dispersive magnon features are compared with those in bulk α-Fe2O3 particles at various temperatures to highlight differences in mode intensity and width. The interchanged spectral intensities in the nanorod are a consequence of a suppressed spin orientation, and this is also evident in the neutron diffraction which demonstates that the weak ferromagnetic phase survives to 1.5 K. Transmission electron microscopy shows that the ellipsoidal particles are single-crystalline with a typical length of 300  ±  100 nm and diameter of 60  ±  10 nm. The main magnon features are similar in bulk and nanoforms and can be explained using a model Hamiltonian based on Samuelson and Shirane's classical theory with exchange constants of J 1  =  −1.03 meV, J 2  =  −0.28 meV, J 3  =  5.12 meV and J 4  =  4.00 meV. Numerical simulations show that two distinct mechanisms may contribute to the magnon line broadening in the nanorods: a distribution of exchange interactions caused by disorder, and a shortened quasiparticle lifetime caused by the scattering of spin waves at surfaces.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherInstitute of Physics Publishing
dc.rights© 2019 IOP Publishing Ltd
dc.sourceJournal of Physics: Condensed Matter
dc.titleSpin-wave propagation in alpha-Fe2O3 nanorods: the effect of confinement and disorder
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume31
dc.date.issued2019
local.identifier.absfor030606 - Structural Chemistry and Spectroscopy
local.identifier.absfor020404 - Electronic and Magnetic Properties of Condensed Matter; Superconductivity
local.identifier.ariespublicationu3102795xPUB1978
local.publisher.urlhttp://www.iop.org/
local.type.statusPublished Version
local.contributor.affiliationCortie, David, The University of Wollongong
local.contributor.affiliationCasillas-Garcia, Gilberto, The University of Wollongong
local.contributor.affiliationSquires, Andrew, University of Wollongong
local.contributor.affiliationMole, Richard, The Australian Nuclear Science and Technology Organisation
local.contributor.affiliationWang, Xiaolin, University of Wollongong
local.contributor.affiliationLiu, Yun, College of Science, ANU
local.contributor.affiliationChen, Yen-Hua, National Cheng Kung University
local.contributor.affiliationYu, Dehong, Australian Nuclear Science and Technology Organisation
local.description.embargo2037-12-31
local.bibliographicCitation.issue18
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage13
local.identifier.doi10.1088/1361-648X/ab04ca
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2019-11-25T07:33:10Z
local.identifier.thomsonID4.60776E+11
CollectionsANU Research Publications

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