Abstract
The permeability spectra and giant magnetoimpedance (GMI) profiles have been measured as a function of annealing temperature, Ta in field-annealed Co-based amorphous ribbon. The permeability spectra show the superposition of two dispersions of Debye type for Ta≤200°C. As Ta increases over 250°C, the low frequency dispersion begins to decrease, and eventually disappears for Ta≥350°C due to the exchange coupling with the bias field formed in surface crystalline layer. However, the high frequency dispersion increases with Ta up to 350°C and then becomes nearly constant. The GMI profile measured at 0.1 MHz shows a one peak in the samples of Ta≤300°C. As Ta increases over 350°C, the GMI-valve is revealed due to the influence of bias field on wall motion. As the Ta increases over 450°C, the asymmetric two peaks of GMI profile are shown instead of the GMI valve due to the damping of wall motion after the crystallization.
Original language | English |
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Pages (from-to) | 5260-5262 |
Number of pages | 3 |
Journal | Journal of Applied Physics |
Volume | 87 |
Issue number | 9 II |
DOIs | |
State | Published - May 2000 |
Event | 44th Annual Conference on Magnetism and Magnetic Materials - San Jose, CA, United States Duration: 15 Nov 1999 → 18 Nov 1999 |