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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estudos de nanoestruturas magnéticas - nanodiscos com impurezas e nanofitas - Via Monte Carlo Metropolis

Paixão, Everton Luiz Martins da 19 April 2013 (has links)
Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-06-08T13:54:44Z No. of bitstreams: 1 evertonluizmartinsdapaixao.pdf: 7260792 bytes, checksum: 8a1a1accd3cfb65d925f1429e761f688 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-06-26T19:03:05Z (GMT) No. of bitstreams: 1 evertonluizmartinsdapaixao.pdf: 7260792 bytes, checksum: 8a1a1accd3cfb65d925f1429e761f688 (MD5) / Made available in DSpace on 2017-06-26T19:03:05Z (GMT). No. of bitstreams: 1 evertonluizmartinsdapaixao.pdf: 7260792 bytes, checksum: 8a1a1accd3cfb65d925f1429e761f688 (MD5) Previous issue date: 2013-04-19 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Neste trabalho usamos o método de Monte Carlo Metropolis aplicado em sistemas magnéticos para estudar nanoestruturas como nanodiscos e nanofios de Permalloy. Dividimos em duas partes. Primeiramente, estudou-se o comportamento do núcleo do vórtice rodeado por anéis de impurezas em nanodiscos de permalloy. Variamos o raio e a espessura dos anéis e medimos o limite do campo aplicado para que o núcleo do vórtice passe através destes anéis. Em segundo lugar, temos estudado os estados fundamentais (de menor energia) para nanofios para uma pequena região do espaço de fase. Podemos identificar as configurações de rotação associadas a estes estados. / In this work we have used Monte Carlo Metropolis method applied in magnetic systems to study nanostructures like permalloy nanodisks and nanowires. We divided it in two parts. First, we have studied the behavior of the vortex core surrounded by rings of the impurities in permalloy nanodisks. We have varied the radius and the thickness of the rings and we measure the limit of the applied field for that the vortex core passes through the ring. Second, we have studied the ground states (lowest-energy state) for nanowires to a small region of the phase space. We can identify the spin configurations associated to the these states.

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