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

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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.date.issued2019
dc.date.updated2019-11-25T07:33:10Z
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/pdfen_AU
dc.identifier.issn0953-8984en_AU
dc.identifier.urihttp://hdl.handle.net/1885/201698
dc.language.isoen_AUen_AU
dc.provenancehttp://sherpa.ac.uk/romeo/issn/0953-8984/..."Post-print on institutional website, institutional repository, subject-based repository, PubMed Central, non-commercial scientific social network or third party eprint servers after 12 months embargo" from SHERPA/RoMEO site (as at 19/03/2020).
dc.publisherInstitute of Physics Publishingen_AU
dc.rights© 2019 IOP Publishing Ltden_AU
dc.sourceJournal of Physics: Condensed Matteren_AU
dc.titleSpin-wave propagation in alpha-Fe2O3 nanorods: the effect of confinement and disorderen_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Access
local.bibliographicCitation.issue18en_AU
local.bibliographicCitation.lastpage13en_AU
local.bibliographicCitation.startpage1en_AU
local.contributor.affiliationCortie, David, The University of Wollongongen_AU
local.contributor.affiliationCasillas-Garcia, Gilberto, The University of Wollongongen_AU
local.contributor.affiliationSquires, Andrew, University of Wollongongen_AU
local.contributor.affiliationMole, Richard, The Australian Nuclear Science and Technology Organisationen_AU
local.contributor.affiliationWang, Xiaolin, University of Wollongongen_AU
local.contributor.affiliationLiu, Yun, College of Science, ANUen_AU
local.contributor.affiliationChen, Yen-Hua, National Cheng Kung Universityen_AU
local.contributor.affiliationYu, Dehong, Australian Nuclear Science and Technology Organisationen_AU
local.contributor.authoremailu4036265@anu.edu.auen_AU
local.contributor.authoruidLiu, Yun, u4036265en_AU
local.description.notesImported from ARIES
local.identifier.absfor030606 - Structural Chemistry and Spectroscopyen_AU
local.identifier.absfor020404 - Electronic and Magnetic Properties of Condensed Matter; Superconductivityen_AU
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciencesen_AU
local.identifier.ariespublicationu3102795xPUB1978en_AU
local.identifier.citationvolume31en_AU
local.identifier.doi10.1088/1361-648X/ab04caen_AU
local.identifier.thomsonID4.60776E+11
local.identifier.uidSubmittedByu3102795en_AU
local.publisher.urlhttp://www.iop.org/en_AU
local.type.statusAccepted Versionen_AU

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