Specialized iNANO Lecture: Atomic-scale control of graphene magnetism using hydrogen atoms

Ivan Brihuega 1,2 1 Dept. de Física de la Materia Condensada, Universidad Autónoma de Madrid, Spain & 2 Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Spain

Info about event

Time

Thursday 28 September 2017,  at 15:15 - 16:00

Location

iNANO meeting room 1590-213, Gustav Wieds Vej 14, 8000 Aarhus C

Ivan Brihuega 1,2
1 Dept. de Física de la Materia Condensada, Universidad Autónoma de Madrid, Spain & 2 Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Spain


Atomic-scale control of graphene magnetism using hydrogen atoms

Incorporating magnetism to the long list of graphene capabilities has been pursued since its first isolation in 2004. In this talk I will show how we use a scanning tunneLling microscope to explore and manipulate graphene p-magnetism at an atomic level. Our work shows how the absorption of single H atoms on graphene magnetizes the graphene regions around them. In contrast to common magnetic materials, where the magnetic moments are localized in a few angstroms, the induced graphene magnetic moments extend over several nanometers and present an atomically modulated spin texture. Our measurements also prove that the induced magnetic moments couple strongly at very long distances following a particular rule: magnetic moments sum-up or neutralize critically depending on the relative H-H adsorption sites [1].Fig. 1. Left, STM topography of a single H atom chemisorbed in graphene. Right, STS measurements of the LDOS induced by the H atom, showing the appearance of a fully polarized peak at EF, and of graphene.


References
1.        H. González-Herrero, J. M. Gómez-Rodríguez, P. Mallet, M. Moaied, J. J. Palacios, C. Salgado, M.M. Ugeda, J. Y. Veuillen, F. Ynduráin, I. Brihuega, Science, 352, 437 (2016)


Host: Associate professor Liv Hornekær, iNANO & Dept. of Physics and Astronomy, Aarhus University


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