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Title: Configurações magnéticas colineares e não-colineares em currais de Fe, Cr e Mn sobre a Pt (111)
metadata.dc.creator: RIBEIRO, Marcelo de Souza
metadata.dc.contributor.advisor1: KLAUTAU, Ângela Burlamaqui
Keywords: Matéria condensada
Estrutura eletrônica
Densidade funcional
Issue Date: 2010
Publisher: Universidade Federal do Pará
Citation: RIBEIRO, Marcelo de Souza. Configurações magnéticas colineares e não-colineares em currais de Fe, Cr e Mn sobre a Pt (111). 2010. 97 f. Dissertação (Mestrado) - Universidade Federal do Pará, Instituto de Ciências Exatas e Naturais, Belém, 2010. Programa de Pós-Graduação em Física.
Abstract: In this study, we investigated the magnetic properties of Fe, Cr and Mn corrals adsorbed on a Pt (111) surface using the first principle RS-LMTO-ASA (Real Space Linear Muffin Tin Orbital – Atomic Sphere Approximation) method, which is based on the Density Functional Theory (DFT), which allows for non-collinear magnetic ordering. We obtained that the Fe atoms posses a large magnetic moment, of the order of 3.5µB / atom, and have a strong ferromagnetic exchange interaction between nearest neighbors. This leads to collinear magnetic arrangements in the corral. For Mn and Cr corrals on Pt (111) we find that the Mn and Cr present large magnetic moments, of the order of 4.51µB / atom and 4.15µB / atom respectively, and have antiferromagnetic interatomic exchange interactions between first neighbor. This leads to collinear magnetic arragements in simple corrals, as well as novel non-collinear ordering, as vortex-like structures (skyrmions), for the case of corrals with particular geometry where antiferromagnetism becomes frustrated.
Appears in Collections:Dissertações em Física (Mestrado) - PPGF/ICEN

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