Neutron spectroscopy of α-Fe2O3 nanorods: direct detection of long-range spin wave excitations

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dc.contributor.authorCortie, DLen_AU
dc.contributor.authorCasillas-Garcia, Gen_AU
dc.contributor.authorSquires, Aen_AU
dc.contributor.authorMole, RAen_AU
dc.contributor.authorWang, XLen_AU
dc.contributor.authorLiu, Yen_AU
dc.contributor.authorChen, YHen_AU
dc.contributor.authorYu, DHen_AU
dc.date.accessioned2023-12-07T22:31:25Zen_AU
dc.date.available2023-12-07T22:31:25Zen_AU
dc.date.issued2018-11-18en_AU
dc.date.statistics2023-05-25en_AU
dc.description.abstractWe present time-of-flight neutron spectroscopy data from PELICAN on α-Fe2O3 nanorods with an average length of 300 ± 100 nm and diameter of 60 ± 10 nm. A strong quasi-elastic neutron signal is associated with absorbed water on the nanoparticle powder, which can be removed through heat treatment. After suppressing the QENS signal, it is possible to observe weak spin wave excitations originating from the antiferromagnetic structure of the α-Fe2O3 nanocrystals. The excitations are directly compared with measurements conducted on larger microscale α-Fe2O3 particles at various temperatures to highlight differences in mode intensity and width. The interchanged spectral in tensities 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. The main magnon features are similar in bulk and nanoforms and can be explained using a model Hamiltonian considering interactions up to fourth nearest-neighbors. Complementary scanning transmission electron microscopy data is presented in order to clarify the atomic-scale structure and morphology of the rods. Finally, the implications are discussed for technological devices based on magnonic transmission at surfaces and through nanowires [2]. ©The Authors.en_AU
dc.identifier.citationCortie, D., Casillas-Garcia, G., Squires, A., Mole, R., Wang, X., Liu, Y., Chen, Y.-H., & Yu, D. (2018). Neutron spectroscopy of α-Fe2O3 nanorods: direct detection of long-range spin wave excitations. Presentation to the ANBUG-AINSE Neutron Scattering Symposium, AANSS 2018, AINSE Conference Centre New Illawarra Road Lucas Heights NSW 2234, Australia, Monday 19 November 2018 - Wednesday 21 November 2018, (pp. 11). Retrieved from https://events01.synchrotron.org.au/event/84/book-of-abstracts.pdfen_AU
dc.identifier.conferenceenddate2018-11-21en_AU
dc.identifier.conferencenameANBUG-AINSE Neutron Scattering Symposium, AANSS 2018en_AU
dc.identifier.conferenceplaceLucas Heights, New South Walesen_AU
dc.identifier.conferencestartdate2018-11-19en_AU
dc.identifier.pagination11en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15270en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Nuclear Science and Engineering (AINSE)en_AU
dc.relation.urihttps://events01.synchrotron.org.au/event/84/book-of-abstracts.pdfen_AU
dc.subjectNeutronsen_AU
dc.subjectSpectroscopyen_AU
dc.subjectDataen_AU
dc.subjectNanoparticlesen_AU
dc.subjectNanocrystalsen_AU
dc.subjectIron oxidesen_AU
dc.subjectNeutron diffractionen_AU
dc.titleNeutron spectroscopy of α-Fe2O3 nanorods: direct detection of long-range spin wave excitationsen_AU
dc.typeConference Abstracten_AU
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