Current Annealings and Magnetoimpedance in Co-Fe Amorphous Ribbons |
| J. González, L. DomĂnguez, J.M. Blanco, P. Aragoneses Departmento de Fisica de Materiales, Universidad del Pais Vasco, P.O. Box 1072, 20080 San Sebastian, Spain and R. Valenzuela Instituto de Investigaciones en Materiales, National University of Mexico, P.O. Box 70-360, 04510 Mexico, Mexico |
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| Amorphous ribbons of composition (Co0.95Fe0.05)100-xSi0.4x B0.6x, 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. |
| DOI: 10.12693/APhysPolA.91.451 PACS numbers: 75.50.Kj, 75.60.Nt |