Show simple item record

dc.contributor.authorSHVETS, IGORen
dc.contributor.authorARORA, SUNILen
dc.contributor.authorWU, HAN-CHUNen
dc.date.accessioned2010-07-14T13:16:03Z
dc.date.available2010-07-14T13:16:03Z
dc.date.issued2008en
dc.date.submitted2008en
dc.identifier.citationArora, S. K.; Wu, H. C.; Choudhary, R. J.; Shvets, I. V.; Mryasov, O. N.; Yao, H. Z.; Ching, W. Y., Giant magnetic moment in epitaxial Fe3O4 thin films on MgO (100), Physical Review B, 77, 13, 2008, 134443en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/40320
dc.descriptionPUBLISHEDen
dc.description.abstractMagnetization studies on well characterized epitaxial magnetite (Fe3O4) thin films grown on MgO(100) show that the ultrathin films (<5?nm thickness) are ferromagnetic and their magnetic moments are much greater than those of bulk magnetite, particularly at a thickness of 20 nm or below. The observation of a ferromagnetic nature in ultrathin magnetite films (<5?nm) is in contrast to the previously accepted dead layer interface model or a superparamagnetic behavior for ultrathin films of magnetite. From detailed spin-polarized density functional theory based calculations of Fe3O4-MgO interface, we calculate a deviation in spin moment of the Fe atoms in the vicinity of the interface from their bulk values, which is insufficient to explain the observed results. Orbital moment contribution for the surface Fe atoms was found to be quite small. The noncompensation of spin moments between the tetrahedral (A) and octahedral (B) sublattices at the surface and antiphase-domain boundaries are inferred to be the main factor contributing to the observed enhanced magnetic moment.en
dc.description.sponsorshipThis work was supported by the Science Foundation of Ireland SFI under Contract No. 06/IN.1/I91. W.Y.C. was supported by U.S. DOE under Grant No. DE-FG02- 84dr45170. O.N.M. is grateful to the SFI for financial support during his stay at TCD. The authors would like to thank R. G. S. Sofin and G. Manai for useful discussions and technical help.en
dc.format.extent134443en
dc.language.isoenen
dc.relation.ispartofseriesPhysical Review Ben
dc.relation.ispartofseries77en
dc.relation.ispartofseries13en
dc.rightsYen
dc.subjectAtomic, molecular and chemical physicsen
dc.subjectthin filmsen
dc.titleGiant magnetic moment in epitaxial Fe3O4 thin films on MgO (100)en
dc.typeJournal Articleen
dc.contributor.sponsorScience Foundation Ireland (SFI)en
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/ivchvetsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/wuh2en
dc.identifier.rssinternalid55243en
dc.identifier.rssurihttp://dx.doi.org/10.1103/PhysRevB.77.134443en


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record