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Current Annealings and Magnetoimpedance in Co-Fe Amorphous Ribbons

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González J., Domínguez L., Blanco J. M., Aragoneses P., Valenzuela R.
Acta Physica Polonica A
|
1997
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vol. 91
|
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.
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