Depth control of ferromagnetism in FePt3 films by ion-irradiation

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dc.contributor.authorCauser, GLen_AU
dc.contributor.authorCortie, DLen_AU
dc.contributor.authorZhu, HLen_AU
dc.contributor.authorIonescu, Men_AU
dc.contributor.authorMankey, GJen_AU
dc.contributor.authorKlose, Fen_AU
dc.date.accessioned2021-08-24T21:04:24Zen_AU
dc.date.available2021-08-24T21:04:24Zen_AU
dc.date.issued2017-07-12en_AU
dc.date.statistics2021-08-16en_AU
dc.description.abstractThe roadmap which outlines storage technology of magnetic hard disk drives predicts storage densities above 5 Tb/in2 to be realised by isolated, individually addressable ferromagnetic (FM) bits of <10 nm in lateral dimension. In principle, artificially patterned structures of this type can be manufactured by x-ray, ion-and electron-beam lithography. However, there may be alternative solutions for obtaining these regular, nanoscale patterns of isolated FM dots. Our proposal is to locally transform a non-magnetic layer into a pattern of geometrically defined FM islands. Such a phase transition could be initiated by locally changing some physical parameter of the layer, such as its strain state or chemical composition leading to ferromagnetism. Here, we present a chemical order (paramagnetic) to chemical disorder (FM) phase transition stimulated by He+ irradiation of a FePt3 thin film. This talk will present preliminary work focussing on depth profiling the ion-beam induced FM order. By controlling the energy (15 keV) and fluence (2x1016 ions/cm2) of the ion-beam, we show ferromagnetism can be locally induced into the upper-half volume of the initially chemically well-ordered 280 nm FePt3 film. Polarised neutron reflectometry was used to investigate the depth dependence of the layer averaged ion-beam induced FM moment within the thin film. Data analysis of the Kiessig fringes observed in the reflectivity post-irradiation suggest the FM / nonmagnetic interface is atomically sharp. The resulting bilayer structure was found to be homogenous in chemical composition but heterogeneous in both chemical and magnetic orders.en_AU
dc.identifier.citationCauser, G. L., Cortie, D. L., Zhu, H., Ionescu, M., Mankey, G. J., & Klose, F. (2017). Depth control of ferromagnetism in FePt3 films by ion-irradiation. Paper presented at ICNS 2017 (International Conference on Neutron Scattering), Daejeon, South Korea, 9 to 13 July 2017. Retrieved from: http://www.icns2017.org/program.phpen_AU
dc.identifier.conferenceenddate13 July 2017en_AU
dc.identifier.conferencenameICNS 2017 (International Conference on Neutron Scattering)en_AU
dc.identifier.conferenceplaceDaejeon, South Koreaen_AU
dc.identifier.conferencestartdate9 July 2017en_AU
dc.identifier.urihttp://www.icns2017.org/program.phpen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11457en_AU
dc.language.isoenen_AU
dc.publisherInternational Conference on Neutron Scatteringen_AU
dc.subjectFerromagnetismen_AU
dc.subjectPhase transformationsen_AU
dc.subjectChemical compositionen_AU
dc.subjectIrradiationen_AU
dc.subjectIon beamsen_AU
dc.subjectNeutron reflectorsen_AU
dc.titleDepth control of ferromagnetism in FePt3 films by ion-irradiationen_AU
dc.typeConference Abstracten_AU
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