Browsing by Author "Pereira, Afranio Rodrigues"

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    Emergence and mobility of monopoles in a unidirectional arrangement of magnetic nanoislands.
    (2015) Loreto, Renan Pires; Morais, L. A.; Melo, Winder Alexander de Moura; Pereira, Afranio Rodrigues; Silva, R. C.; Nascimento, Fábio Santos; Mól, Lucas Alvares da Silva
    Magnetricity, the magnetic equivalent of electricity, was recently verified experimentally for the first time. Indeed, like the stream of electric charges that produces electric current, emergent magnetic monopoles have been observed to roam freely in geometrically frustrated magnets known as spin ice. However, such phenomena demand extreme physical conditions, say, a single spin ice crystal has to be cooled to very low temperature, around 0.36 K. Candidates to overcome this difficulty are their artificial analogues, the so-called artificial spin ices. Here, we demonstrate that a specific unidirectional arrangement of nanoislands yields a peculiar system where magnetic monopoles emerge and are constrained to move along aligned dipoles, providing an ordered flow of magnetic charges at room temperature.
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    Magnetic vortex crystal formation in the antidot complement of square artificial spinice.
    (2014) Araujo, Clodoaldo Irineu Levartoski de; Silva, Rodrigo da Costa; Ribeiro, Igor Renato Bueno; Nascimento, Fábio Santos; Felix, Jorlandio Francisco; Ferreira, Sukarno Olavo; Mól, Lucas Alvares da Silva; Melo, Winder Alexander de Moura; Pereira, Afranio Rodrigues