SKM 2021 – scientific programme

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SYES: Symposium Spain as Guest of Honor

SYES 1: Spain as Guest of Honor

SYES 1.3: Invited Talk

Wednesday, September 29, 2021, 14:10–14:40, Audimax 2

Adding magnetic functionalities to epitaxial graphene — •Rodolfo Miranda — IMDEA Nanociencia, Madrid, Spain — Universidad Autónoma Madrid, Madrid, Spain

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

i)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.

ii)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. The system is a suitable candidate for the observation of Spin Hall Effect in graphene

iii)Finally, epitaxial graphene/Co(111)/Pt(111) stacks grown on MgO(111) 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, protected by graphene is stable at 300 K in air.