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dc.contributor.authorCOEY, JOHNen
dc.contributor.authorVENKATESAN, MUNUSWAMYen
dc.date.accessioned2011-09-16T14:38:40Z
dc.date.available2011-09-16T14:38:40Z
dc.date.issued2011en
dc.date.submitted2011en
dc.identifier.citationA. Rostamnejadi, M. Venkatesan, J. Alaria, M. Boese, P. Kameli, H. Salamati, and J. M. D. Coey, Conventional and inverse magnetocaloric effects in La(0.45)Sr(0.55)MnO(3) nanoparticles, Journal of Applied Physics, 110, 4, 2011, 043905-en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/59505
dc.descriptionPUBLISHEDen
dc.description.abstractThe magnetocaloric effect of La(0.45)Sr(0.55)MnO(3) nanoparticles was studied by dc magnetization measurements. A sample with mean particle size of about 140 nm exhibits both a conventional magnetocaloric effect around the Curie temperature (approximate to 295 K) and a large inverse magnetocaloric effect around the antiferromagnetic-ferromagnetic transition temperature (approximate to 200 K). The change of magnetic entropy increases monotonically with applied magnetic field and reaches the values of 5.51 J/kg K and - 2.35 J/kg K at 200 K and 295 K, respectively, in an applied field of 5 T. The antiferromagnetic-ferromagnetic transition is absent in a 36 nm size sample, which shows only a broad ferromagnetic transition around 340 K and a small change in magnetic entropy near room temperature. The results are discussed in terms of the entropy difference between the A-type antiferromagnetic ground state of La(0.45)Sr(0.55)MnO(3) and the low moment ferromagnetic state. By comparing the results obtained on nanoparticles and bulk La(0.45)Sr(0.55)MnO(3), one can conclude that the inverse magnetocaloric effect in a material showing the antiferromagnetic-ferromagnetic transition could be improved over a wide range of temperature by tuning the spin disorder in the antiferromagnetic state.en
dc.description.sponsorshipThis work was supported by Science Foundation Ireland (SFI) as part of the MANSE project Grant No. SFI05/IN/1850. A.R. carried out much of the experimental work while on sabbatical leave in Dublin from the Isfahan University of Technology. He is grateful to K. Ackland for his help with the TEM experiment measurements.en
dc.format.extent043905en
dc.language.isoenen
dc.relation.ispartofseriesJournal of Applied Physicsen
dc.relation.ispartofseries110en
dc.relation.ispartofseries4en
dc.rightsYen
dc.subjectCondensed matter physicsen
dc.subjectMANGANITESen
dc.titleConventional and inverse magnetocaloric effects in La(0.45)Sr(0.55)MnO(3) 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.peoplefinderurlhttp://people.tcd.ie/venkatemen
dc.identifier.rssinternalid74985en
dc.contributor.sponsorGrantNumberSFI05/IN/1850en
dc.subject.TCDThemeNanoscience & Materialsen
dc.identifier.rssurihttp://dx.doi.org/10.1063/1.3614586en


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