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TT: Fachverband Tiefe Temperaturen

TT 100: Graphene: Adsorption, Intercalation, Doping (organized by O)

TT 100.11: Vortrag

Donnerstag, 3. April 2014, 18:30–18:45, WIL C107

Electronic and magnetic properties of cobalt interaction with graphene on Ir(111) — Hendrik Vita, Stefan Böttcher, and •Karsten Horn — Fritz-Haber-Institut of the Max-Planck-Society, Faradayweg 4-6, 14195 Berlin, Germany

The interaction of graphene with transition metal surfaces has attracted much interest because these are ideal templates for the growth of high quality films. Ferromagnetic substrates such as Ni(111) and Co(0001) are interesting since graphene grown on these surfaces can act as a spin filter. We have earlier found that the proximity of graphene to the ferromagnetic Ni(111) substrate induces a sizeable magnetic moment in the carbon π -states as determined from carbon K edge XMCD. Here we study the influence of thin layers of ferromagnetic Co sandwiched between Ir(111) and graphene with consequences for the magnetic properties expected. We find that the cobalt films show ferromagnetic behavior even for very low thicknesses. In order to study the behavior of magnetic heterostructures utilizing graphene as an interlayer we examine sandwich systems consisting of a thin layer of cobalt on top graphene/Ni(111). Using element-specific XMCD and hysteresis measurements it is possible to gain insight into the magnetic coupling across this magnetic heterostructure.