Nitrogen-induced reconstructions on the Cr(001) surface

ORAL

Abstract

Cr is an essential material for various spintronic devices due to its magnetic properties. Nevertheless, it is necessary to selectively introduce a contaminant –like Nitrogen– during its synthesis to stabilize its highly-reactive surface. The main drawback is that N changes the electronic and magnetic properties; so, describing the adsorption and properties of adsorbed N is necessary. We described different reconstructions models of N on Cr(001) using DFT calculations andSTM data. With a theoretical thermodynamic analysis we identified the stable models for different growth conditions. From the four stable models, two were already described experimentally, while we confirmed the other two with a comparison of theoretical STM images and STM experiments. Both are in a c(2x2) configuration and the first one has N adsorbed on the hollow sites, while the second has N substituting surface Cr. The electronic and magnetic properties of both models confirmed that they preserve the main characteristics of the clean Cr surface.

*We thank DGAPA-UNAM project IN101019, CONACyT grant A1-S-9070, and DGCTIC-UNAM forproject LANCAD-UNAM-DGTIC-051. We also thank support by the United States DoE Award DE-FG02-06ER46317.

–

Presenters

  • Emiliano Ventura-Macias

    • Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México

Authors

  • Emiliano Ventura-Macias

    • Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México

  • Jonathan Guerrero Sanchez

    • Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México
    • Center of Nanoscience and Nanotechology, National Autonomous University of Mexico
    • National Autonomous University of Mexico Institute of Nanoscience and Nanotechnology
    • Centro de Nanociencias y Nanotecnologia, UNAM
    • Centro de Nanociencias y Nanotecnologia, Universidad Nacional Autonoma de Mexico
    • Universidad Nacional Autónoma de México
    • UNAM - CCMC
    • Center for Nanosciences and Nanotechnology National Autonomous University of Mexico

  • Joseph Corbett

    • Ohio State Univ - Columbus
    • Department of Physics and Astronomy, Ohio University

  • Arthur Smith

    • Ohio University
    • Department of Physics and Astronomy, Ohio University
    • Nanoscale and Quantum Phenomena Institute, Department of Physics and Astronomy, Ohio University

  • Noboru Takeuchi

    • Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México
    • Center of Nanoscience and Nanotechology, National Autonomous University of Mexico
    • National Autonomous University of Mexico Institute of Nanoscience and Nanotechnology
    • Centro de Nanociencias y Nanotecnologia, Universidad Nacional Autonoma de Mexico
    • Universidad Nacional Autónoma de México
    • National Autonomous University of Mexico