Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 221, Issue 3, Pages L243-L247Publisher
ELSEVIER
DOI: 10.1016/S0304-8853(00)00554-0
Keywords
giant magneto-impedance; glass-coated microwires; joule heating
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The influence of current annealing on magnetic properties of Joule-heated amorphous CO68.25Fe4.5Si12.25B15 glass-covered microwire (29.3 mum) is investigated. Annealing without applied stress can produce short-range order relaxation and consequently improves the sample's soft magnetic properties. The maximum relative change of impedance measured for a drive current frequency of 15 MHz is about 600% with a maximum slope sensitivity of 4%/A m(-1) (about 320%/Oe) for special annealing conditions (10 min annealing with applied current I-d = 70 mA). This value is about 10 times higher than the maximum value so far reported for glass-covered microwires. (C) 2000 Elsevier Science B.V. All rights reserved.
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