SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 73: Mini-Symposium: Dzyaloshinskii-Moriya Interaction (DMI) in magnetic layered systems II
O 73.3: Vortrag
Mittwoch, 3. März 2021, 14:20–14:40, R3
DMI in intercalated Pt/Co/graphene thin films: localization in reciprocal and real space — Maria Blanco-Rey1,2, Mikhail Otrokov3,4,2, Andres Arnau4,1,2, and •Jorge I. Cerda5 — 1Universidad del Pais Vasco UPV/EHU, Spain — 2Donostia International Physics Center DIPC, Spain — 3Ikerbasque Foundation, Spain — 4Centro de Fisica de Materiales CFM, CSIC-UPV/EHU, Spain — 5Instituto de Ciencia de Materiales de Madrid ICMM, CSIC, Spain
The Dzyaloshinskii-Moriya interaction (DMI) of Pt(111)/Co and Pt(111)/Co/G films (G=graphene), with face-centered tetragonal Co, has been studied by first-principles calculations in two thickness regimes. For ultrathin Co we find that interlayer additivity of the DMI breaks down and the D-vectors acquire a sizable out-of-plane component. For 5ML Co, DMI localizes at the interfaces and is mainly contributed by the Pt/Co interface. Indeed, an spectral analysis in reciprocal space shows the largest DMI contributions at the crossings of highly-dispersive Pt substrate bands with Co-d bands. Interestingly, the Co/vaccum interface chirality, which is the same as in Pt/Co and smaller in energy by only one order of magnitude, is switched by the effect of graphene. We find that, to account for the DMI energy in this system, a model that includes at least second nearest-neighbour lateral Co-Co interactions is needed.