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dc.contributor.authorAl Ma'Mari, F.
dc.contributor.authorMoorsom, T.
dc.contributor.authorTeobaldi, G.
dc.contributor.authorDeacon, W.
dc.contributor.authorProkscha, T.
dc.contributor.authorLuetkens, H.
dc.contributor.authorLee, Stephen Leslie
dc.contributor.authorSterbinsky, G.E.
dc.contributor.authorArena, D.A.
dc.contributor.authorMaclaren, D.A.
dc.contributor.authorFlokstra, Machiel Geert
dc.contributor.authorAli, M.
dc.contributor.authorWheeler, M.C.
dc.contributor.authorBurnell, G.
dc.contributor.authorHickey, B.J.
dc.contributor.authorCespedes, O.
dc.identifier.citationAl Ma'Mari , F , Moorsom , T , Teobaldi , G , Deacon , W , Prokscha , T , Luetkens , H , Lee , S L , Sterbinsky , G E , Arena , D A , Maclaren , D A , Flokstra , M G , Ali , M , Wheeler , M C , Burnell , G , Hickey , B J & Cespedes , O 2015 , ' Beating the Stoner criterion using molecular interfaces ' , Nature , vol. 524 , no. 7563 , pp. 69-73 .
dc.identifier.otherPURE: 212693127
dc.identifier.otherPURE UUID: 12436bad-d761-4718-944e-9ecfb4683a21
dc.identifier.otherScopus: 84938792285
dc.identifier.otherORCID: /0000-0002-2020-3310/work/54995366
dc.identifier.otherORCID: /0000-0002-4333-1358/work/59953702
dc.identifier.otherWOS: 000359002300033
dc.descriptionThis work was supported by the Engineering and Physical Sciences Research Council through grants EP/K00512X/1, EP/K036408/1, EP/J01060X/1 and EP/I004483/1.en
dc.description.abstractOnly three elements are ferromagnetic at room temperature: the transition metals iron, cobalt and nickel. The Stoner criterion explains why iron is ferromagnetic but manganese, for example, is not, even though both elements have an unfilled 3d shell and are adjacent in the periodic table: according to this criterion, the product of the density of states and the exchange integral must be greater than unity for spontaneous spin ordering to emerge. Here we demonstrate that it is possible to alter the electronic states of non-ferromagnetic materials, such as diamagnetic copper and paramagnetic manganese, to overcome the Stoner criterion and make them ferromagnetic at room temperature. This effect is achieved via interfaces between metallic thin films and C60 molecular layers. The emergent ferromagnetic state exists over several layers of the metal before being quenched at large sample thicknesses by the materiala € s bulk properties. Although the induced magnetization is easily measurable by magnetometry, low-energy muon spin spectroscopy provides insight into its distribution by studying the depolarization process of low-energy muons implanted in the sample. This technique indicates localized spin-ordered states at, and close to, the metal-molecule interface. Density functional theory simulations suggest a mechanism based on magnetic hardening of the metal atoms, owing to electron transfer. This mechanism might allow for the exploitation of molecular coupling to design magnetic metamaterials using abundant, non-toxic components such as organic semiconductors. Charge transfer at molecular interfaces may thus be used to control spin polarization or magnetization, with consequences for the design of devices for electronic, power or computing applications (see, for example, refs 6 and 7).
dc.rightsCopyright 2015 the Authors. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at:
dc.subjectQC Physicsen
dc.titleBeating the Stoner criterion using molecular interfacesen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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