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Journal of Alloys and Compounds 04/2013; 483:682-685. · 2.29 Impact Factor
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Journal of Alloys and Compounds. 08/2009; 483(1-2):682-685.
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ABSTRACT: An experimental study on the influence of a dc magnetic field on the real and imaginary parts of axial diagonal ([zeta]zz) and off-diagonal ([zeta][phi]z) components of the surface magnetoimpedance (MI) tensor in amorphous Fe77.5Si7.5B15 and Co72.5Si12.5B15 wires has been performed. The impedance characteristics have been analysed in the as-cast wires and after being torsion annealed. The ac drive current was 5 mArms flowing along the wires in the frequency range from 0.45 to 0.8 MHz. The MI behaviours can be ascribed to the different domain structures of positive and negative magnetostriction wires, before and after the intrinsic anisotropy distribution has been also modified by the annealing treatment.
Journal of Non-Crystalline Solids 01/2007; · 1.54 Impact Factor
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Journal of Magnetism and Magnetic Materials 01/2006; · 1.78 Impact Factor
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Journal of Magnetism and Magnetic Materials 01/2005; · 1.78 Impact Factor
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Journal of Magnetism and Magnetic Materials. 294(2):202-205.
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Journal of Non-Crystalline Solids. 353(8-10):914-918.
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ABSTRACT: The evolution from the amorphous to nanocrystalline state in Fe73.5Si13.5B9Cu1Nb3 amorphous wires has been studied by means of high-frequency magnetoimpedance (MI) effect, using driving frequencies ranging from 0.1 to 500 MHz. A furnace isothermal annealing has been employed to nanocrystallize the wires (1 h at 565 °C in an argon atmosphere), while other samples were annealed at lower temperatures (300, 400 and 475 °C during 1 h), in order to evaluate the influence of annealing temperature on the MI effect. The MI response is modified by the influence of both the applied bias field and the driving frequency on the current distribution in the samples.
Journal of Magnetism and Magnetic Materials 300(1):24-28. · 1.78 Impact Factor
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[show abstract]
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ABSTRACT: An experimental study on the influence of a dc magnetic field on the real and imaginary parts of axial diagonal (ζzz) and off-diagonal (ζϕz) components of the surface magnetoimpedance (MI) tensor in amorphous Fe77.5Si7.5B15 and Co72.5Si12.5B15 wires has been performed. The impedance characteristics have been analysed in the as-cast wires and after being torsion annealed. The ac drive current was 5 mArms flowing along the wires in the frequency range from 0.45 to 0.8 MHz. The MI behaviours can be ascribed to the different domain structures of positive and negative magnetostriction wires, before and after the intrinsic anisotropy distribution has been also modified by the annealing treatment.
Journal of Non-Crystalline Solids 353:914-918. · 1.54 Impact Factor
