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Title: Anomalous magnetoresistance in Fibonacci multilayers
Authors: Bezerra, Claudionor Gomes
Machado, Leonardo Dantas
Corrêa, Marcio Assolin
Feitosa, Carlos Chesman de Araújo
Pearson, J.E.
Hoffman, A.
Keywords: Fibonacci multilayers;Magnetoresistance
Issue Date: 15-Jun-2012
Publisher: American Physical Society
Citation: MACHADO, L.; BEZERRA, C.G.; CORREA, M. A. ; FEITOSA, C.C.A.; PEARSON, J.; HOFFMANN, A. . Anomalous magnetoresistance in Fibonacci multilayers. Physical Review. B: Condensed Matter and Materials Physics, v. 85, p. 224416, 2012. Disponível em: Acesso em: 02 jul. 2020.
Portuguese Abstract: We theoretically investigated magnetoresistance curves in quasiperiodic magnetic multilayers for two different growth directions, namely, [110] and [100]. We considered identical ferromagnetic layers separated by nonmagnetic layers with two different thicknesses chosen based on the Fibonacci sequence. Using parameters for Fe/Cr multilayers, four terms were included in our description of the magnetic energy: Zeeman, cubic anisotropy, bilinear coupling, and biquadratic coupling. The minimum energy was determined by the gradient method and the equilibrium magnetization directions found were used to calculate magnetoresistance curves. By choosing spacers with a thickness such that biquadratic coupling is stronger than bilinear coupling, unusual behaviors for the magnetoresistance were observed: (i) for the [110] case, there is a different behavior for structures based on even and odd Fibonacci generations, and, more interesting, (ii) for the [100] case, we found magnetic field ranges for which the magnetoresistance increases with magnetic field
ISSN: 2469-9950
Appears in Collections:CCET - DFTE - Artigos publicados em periódicos

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