70876 20191113135212.0 doi 10.1021/acs.nanolett.7b00311 sideral 92213 ART-2017-92213 eng Martínez Velarte, Maria del Carmen Chemical disorder in topological insulators: A route to magnetism tolerant Topological surface States 2017 Access copy available to the general public Unrestricted We show that the chemical inhomogeneity in ternary 3D topological insulators preserves the topological spin texture of their surface states against a net surface magnetization. The spin texture is that of a Dirac cone with helical spin structure in the reciprocal space, which gives rise to spin-polarized and dissipation-less charge currents. Thanks to the non-trivial topology of the bulk electronic structure, this spin texture is robust against most types of surface defects. However, magnetic perturbations break the time-reversal symmetry, enabling magnetic scattering and loss of spin coherence of the charge carriers. This intrinsic incompatibility precludes the design of magnetoelectronic devices based on the coupling between magnetic materials and topological surface states. We demonstrate that the magnetization coming from individual Co atoms deposited on the surface can disrupt the spin coherence of the carriers in the archetypal topological insulator Bi2Te3, while in Bi2Se2Te the spin texture remains unperturbed. This is concluded from the observation of elastic backscattering events in quasiparticle interference patterns obtained by scanning tunneling spectroscopy. The mechanism responsible for the protection is investigated by energy resolved spectroscopy and ab-initio calculations, and it is ascribed to the distorted adsorption geometry of localized magnetic moments due to Se-Te disorder, which suppresses the Co hybridization with the surface states info:eu-repo/grantAgreement/ES/MINECO/MAT2013-46593-C6-3-P info:eu-repo/grantAgreement/ES/MINECO/MAT2013-46593-C6-2-P info:eu-repo/grantAgreement/EC/FP7/304043/EU/High Performance Energy Conversion by the interplay between Thermoelectricity and Spin Seebeck Effect/THERMO-SPINTRONIC info:eu-repo/grantAgreement/ES/DGA/E26 info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 12.08 2017 CHEMISTRY, PHYSICAL 11 / 146 = 0.075 2017 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 19 / 285 = 0.067 2017 Q1 T1 NANOSCIENCE & NANOTECHNOLOGY 10 / 92 = 0.109 2017 Q1 T1 PHYSICS, CONDENSED MATTER 8 / 67 = 0.119 2017 Q1 T1 CHEMISTRY, MULTIDISCIPLINARY 15 / 171 = 0.088 2017 Q1 T1 PHYSICS, APPLIED 9 / 146 = 0.062 2017 Q1 T1 7.447 2017 Bioengineering 2017 Q1 Chemistry (miscellaneous) 2017 Q1 Nanoscience and Nanotechnology 2017 Q1 Materials Science (miscellaneous) 2017 Q1 Mechanical Engineering 2017 Q1 Condensed Matter Physics 2017 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Kretz, Bernhard (orcid)0000-0003-4180-0752 Moro-Lagares, María (orcid)0000-0002-1296-4793 Aguirre, Myriam Haydee Universidad de Zaragoza Riedemann, Trevor M. Lograsso, Thomas A. (orcid)0000-0003-3724-508X Morellon, Luis Universidad de Zaragoza (orcid)0000-0003-0681-8260 Ibarra, M Ricardo Universidad de Zaragoza Garcia-Lekue, Aran (orcid)0000-0002-3260-9641 Serrate, David Universidad de Zaragoza 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 17, 7 (2017), 4047-4054 Nano lett. Nano Letters 1530-6984 1190212 http://zaguan.unizar.es/record/70876/files/texto_completo.pdf Postprint 55353 http://zaguan.unizar.es/record/70876/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:70876 articulos driver 2019-11-13-13:44:44 ARTICLE