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|Type:||Artigo de periódico|
|Title:||Anomalous magnetoresistance in Fibonacci multilayers|
|Abstract:||We theoretically investigated magnetoresistance curves in quasiperiodic magnetic multilayers for two different growth directions, namely,  and . 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  case, there is a different behavior for structures based on even and odd Fibonacci generations, and, more interesting, (ii) for the  case, we found magnetic field ranges for which the magnetoresistance increases with magnetic field.|
|Editor:||Amer Physical Soc|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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