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dc.contributor.authorCOEY, JOHNen
dc.date.accessioned2015-02-19T10:18:28Z
dc.date.available2015-02-19T10:18:28Z
dc.date.issued2014en
dc.date.submitted2014en
dc.identifier.citationBetto, D., Coey, J.M.D., Vortex state in ferromagnetic nanoparticles, Journal of Applied Physics, 115, 17, 2014, 17D138-en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/73286
dc.descriptionPUBLISHEDen
dc.description.abstractThe evolution of the magnetic state of a soft ferromagnetic nanoparticle with its size is usually thought to be from superparamagnetic single domain to blocked single domain to a blocked multidomain structure. Néel pointed out that a vortex configuration produces practically no stray field at the cost of an increase in the exchange energy, of the order of , where JS 2 is the bond energy, R is the particle radius, and c is of the order of the exchange length. A vortex structure is energetically cheaper than single domain when the radius is greater than a certain value. The correct sequence should include a vortex configuration between the single domain and the multidomain states. The critical size is calculated for spherical particles of four important materials (nickel, magnetite, permalloy, and iron) both numerically and analytically. A vortex state is favored in materials with high magnetisation.en
dc.description.sponsorshipThis work was supported by Science Foundation Ireland as part of the NISE project, Contract No. 10/IN1.13006 and by IRCSET. The authors thank S. Sen, L. Monzon, M. Venkatesan, and K. Rode for suggestionsen
dc.format.extent17D138en
dc.language.isoenen
dc.relation.ispartofseriesJournal of Applied Physicsen
dc.relation.ispartofseries115en
dc.relation.ispartofseries17en
dc.rightsYen
dc.subjectsoft ferromagnetic nanoparticleen
dc.subject.lcshsoft ferromagnetic nanoparticleen
dc.titleVortex state in ferromagnetic nanoparticlesen
dc.typeJournal Articleen
dc.contributor.sponsorScience Foundation Ireland (SFI)en
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/jcoeyen
dc.identifier.rssinternalid100909en
dc.identifier.doihttp://dx.doi.org/10.1063/1.4867597en
dc.rights.ecaccessrightsopenAccess
dc.contributor.sponsorGrantNumber10/IN1.13006en


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