Dresden 2020 – scientific programme

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SYES: Symposium Spain as Guest of Honor

SYES 1: Spain as Guest of Honor I

SYES 1.5: Invited Talk

Thursday, March 19, 2020, 11:45–12:15, HSZ 02

Adding magnetic properties to epitaxial graphene — •Rodolfo Miranda — IMDEA Nanociencia, Madrid, Spain — Dept. Condensed Matter Physics, Universidad Autónoma Madrid

The intrinsic magnetic properties of pristine graphene are negligible, but we show that, by either adsorption of suitable molecules or intercalation of heavy metal atoms, one can create long range magnetic order in hybrid graphene systems, introduce a giant spin-orbit coupling into the π bands of graphene or produce chiral domain walls protected by graphene at 300 K.

A monolayer of TCNQ molecules on graphene grown on Ru(0001) acquire charge and a magnetic moment. The TCNQ monolayer develops spatially extended, spin-split, electronic bands and a magnetically ordered ground-state as visualized by spin-polarized STS. The long range magnetic order is due to direct exchange interaction mediated by overlapping frontier orbitals of the molecules.

Pb-intercalated Graphene grown on Ir(111)develops a giant (70-100 meV) spin-orbit coupling in the π bands of graphene, as detected by spin-ARPES, which is a suitable candidate for the observation of Spin Hall Effect in graphene

Finally, epitaxial graphene/Co(111)/Pt(111) stacks grown on MgO(111) crystals exhibit enhanced Perpendicular Magnetic Anisotropy for Co layers up to 4 nm thick and generate left-handed Néel-type chiral Domain Walls stabilized by interfacial DMI interaction. The magnetic texture is protected by graphene, stable at 300 K in air, and amenable to transport measurements.