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Magnetic dopants on the surface of 2D heavy metal alloys and topological insulators

AutorValbuena, M. A.; Cuxart, M. G.; Robles, Roberto ; Schirone, S.; Moreno, César ; Bonell, Fréderic; Godey, Sylvie; Cruz, Jorge; Xu, Heng; Imaz, Inhar ; Maspoch, Daniel ; Nistor, Corneliu ; Gambardella, Pietro; Mugarza, Aitor
Fecha de publicación2017
Citación1st Workshop Spain-Taiwan: "2D Materials and Interfaces for Spintronics" (2017)
ResumenSpin-Orbit Coupling (SOC) is at the origin of important new phenomena in materials such as heavy metal surface alloys with strong Rashba interaction and topological insulators (TIs), both with evident and promising applications in spintronics. Of special relevance are the emergent phenomena derived from the magnetic interactions in ferromagnetic (FM)/SOC interfaces. The Rashba and topological surface states can be used efficiently for reversing the magnetization of FM thin films by charge currents via spin transfer torque and for spin to charge conversion as a result of an inverse Edelstein effect. Besides, in topological insulators (TIs), long-range interactions between magnetic dopants mediated by the topological surface states can give rise to exotic phenomena such as the quantum anomalous Hall effect and dissipationless spin polarized edge currents. Despite their experimental demonstrations, an atomistic understanding of these phenomena is still missing. In this work we present a systematic experimental investigation on the magnetic properties in model FM/SOC interfaces. In a first step we will use 3d transition metals (TM) adatoms as magnetic dopants on the substitutional BiAg2 surface alloy grown on Ag(111). Through the controlled deposition of a series of TM impurities at cryogenic temperatures we systematically study different magnetic configurations. The influence of the SOC interaction, impurity adsorption sites and surface structure on the magnetic anisotropy is analyzed correlating experimental (XMCD) and theoretical (DFT) data. On the other side, we try to overcome the experimental difficulties of controlling the magnetic ground state and anisotropy of 3d transition metal impurities by using metalorganic molecular networks (porphyrin based) as an alternative strategy for tuning the electronic and magnetic interaction between the dopant and the TI substrate. Here, depending on the transition metal ion, the ligand field related to the organic molecular structure and the molecular charge, the magnetic moment and anisotropy can be consequently manipulated.
DescripciónResumen del trabajo presentado al 1st Workshop Spain-Taiwan: "2D Materials and Interfaces for Spintronics", celebrado en Barcelona (España) del 23 al 25 de octubre de 2017.-- et al.
URIhttp://hdl.handle.net/10261/160548
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