Magnetization enhancement by exchange coupling of antiferromagnetic nanoparticles embedded in ferromagnetic matrix

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dc.contributor.authorDing, Xen_AU
dc.contributor.authorTseng, LTen_AU
dc.contributor.authorLee, WTHen_AU
dc.contributor.authorYi, Jen_AU
dc.date.accessioned2021-10-26T22:18:56Zen_AU
dc.date.available2021-10-26T22:18:56Zen_AU
dc.date.issued2016-11-29en_AU
dc.date.statistics2021-10-12en_AU
dc.description.abstractWe have observed enhanced magnetisation as a consequence of the exchange-coupling of antiferromagnetic nanoparticle embedded in ferromagnetic matrix. Magnetic behaviour in nanostructure has been found to be significantly different from the magnetic behaviour in bulk materials. As an example, Ni cluster has a saturation moment of 2 µB compared to 0.6 µB in bulk form [1]. In our previous work, we found NiO nanoparticles to be a ferromagnet with a saturation magnetization of 105 emu/g at 5 K, corresponding to 1.16 µB/Ni [2]. It should be noted that bulk NiO is an antiferromagnet. However, the high saturation magnetization in these materials can only be observed at very low temperature. In 2003, Skumryev et. al. found that nanostructured Co had an enhanced blocking temperature when coated with antiferromagnetic CoO due to the exchange coupling between Co core and CoO surface [3]. Exchange coupling has therefore been proposed to be a mechanism that can lead to room-temperature high-magnetisation materials. To test this hypothesis, we fabricated Ni/NiO composite thin films using laser-MBE method. Magnetisation measurement using SQUID and layer-by-layer chemical and magnetic structure determination using polarized neutron reflectivity both showed that nanostructured NiO embedded in Ni matrix has led to an enhancement of room-temperature magnetisation higher than that of pure Ni films, thus providing evidence that supports the hypothesis.en_AU
dc.identifier.citationDing, X., Tseng, L.-T., Lee, W. T. H., & Yi, J. (2016). Magnetization enhancement by exchange coupling of antiferromagnetic nanoparticles embedded in ferromagnetic matrix. Paper presented at 13th AINSE-ANBUG Neutron Scattering Symposium, Sydney, NSW, Australia, 29-30 November 2016.en_AU
dc.identifier.conferenceenddate30 November 2013en_AU
dc.identifier.conferencename13th AINSE-ANBUG Neutron Scattering Symposiumen_AU
dc.identifier.conferenceplaceSydney, New South Walesen_AU
dc.identifier.conferencestartdate29 November 2013en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12106en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Nuclear Science and Engineeringen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectNanoparticlesen_AU
dc.subjectMagnetizationen_AU
dc.subjectTemperature range 0065-0273 Ken_AU
dc.subjectComposite materialsen_AU
dc.subjectThin filmsen_AU
dc.titleMagnetization enhancement by exchange coupling of antiferromagnetic nanoparticles embedded in ferromagnetic matrixen_AU
dc.typeConference Abstracten_AU
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