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MA: Fachverband Magnetismus

MA 36: Spin-Dependent 2D Phenomena

MA 36.10: Vortrag

Mittwoch, 18. März 2020, 17:45–18:00, HSZ 101

Ferromagnetism in graphene — •Mukul Kabir — Department of Physics, Indian Institute of Science Education and Research, Pune 411008, India

Metal-free magnetism in graphene has remained a subject of intense research, and many research groups have invested in understanding the roles of doping, structural defects and edge structure in finite-sized nano-flakes. However, a robust long-range magnetic order has remained elusive. In this context, recently nitrogen-doped graphene is experimentally proposed to be a promising candidate, however, the Curie temperature remains controversial. The corresponding exchange mechanism endures unclear and is essential to tune further and manipulate magnetism. In this talk, within the first-principles calculations, we will systematically discuss the local moment formation and the concurrent interaction between various defect complexes. The importance of adatom diffusion on the differential defect abundance will be elaborated. We will establish that the direct exchange mechanism between the delocalized magnetic moment originating from the π-electron at the prevalent triazine complex to be responsible for the observed ferromagnetism.