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Joule Heating Preannealing Effect in the Coercivity Field and Magnetostriction Constant of Co_{66}Fe_{4}Mo_{2}Si_{16}B_{12} Alloy

100%
Garcia Tello P., González J., Blanco J., Żuberek R.
Acta Physica Polonica A
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2000
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vol. 97
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issue 3
595-598
EN
The effect of thermal treatments (by the Joule heating and conventional annealing) on the coercivity and saturation magnetostriction constant in the amorphous and nanocrystalline Co_{66}Fe_{4}Mo_{2}Si_{16}B_{12} alloy is reported. It is noticeable the near insensibility to the external stress of coercive field and anisotropy field (leading to extremely low value of magnetostriction 1.5×10^{-8}) achieved after the Joule heating by two steps (first one to relax the internal stresses and the second one to develop a fine nanocrystalline structure).
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Current Annealings and Magnetoimpedance in Co-Fe Amorphous Ribbons

88%
González J., Domínguez L., Blanco J. M., Aragoneses P., Valenzuela R.
Acta Physica Polonica A
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1997
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vol. 91
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issue 2
451-454
EN
Amorphous ribbons of composition (Co_{0.95}Fe_{0.05})_{100-x}Si_{0.4x} B_{0.6x}, with x=25 and 30 were prepared by the melt-spinning technique. Current annealings at 600 mA were performed for annealing times between 15 s and 60 min. The magnetoimpedance response was investigated by submitting the ribbons to ac currents at frequencies in the 10-200 kHz range, with amplitudes between 1 and 15 mA (rms), and measuring their voltage response. The observed results show that a transverse anisotropy is induced by the thermal treatments, which can be evaluated by means of the magnetoimpedance effect. Due to its lower Curie temperature, the x=30 ribbons exhibited lower sensibility to the current annealings.
3
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Electron Transmission through Graphene Bilayer Flakes

88%
Chico L., González J., Santos H., Pacheco M., Brey L.
Acta Physica Polonica A
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2012
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vol. 122
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issue 2
299-303
EN
We investigate the electronic transport properties of a bilayer graphene flake contacted by two monolayer nanoribbons. This finite-size bilayer flake can be built by overlapping two semi-infinite ribbons. We study and analyze the electronic behavior of this structure by means of a tight-binding method and a continuum Dirac model. We have found that the conductance oscillates markedly between zero and the maximum value of the conductance, allowing for the design of electromechanical switches.
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