ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
We report on tailoring magnetic properties and giant magneto-impedance GMI in glasscoatedmicrowires fabricated by the Taylor-Ulitovsky method, by means of selection of their alloycomposition and/or annealing conditions. Fe-rich microwires subjected to stress annealing show thehysteresis loops of inclined form due to induced transverse magnetic anisotropy, and hence becomesuitable for GMI. The transverse anisotropy depends on the annealing conditions: temperature,duration and stress. The application of external stress further drastically changes the shape of thehysteresis loops and the GMI spectra. The wires with compositions Co-Fe-Ni-Si-B and Co-Fe-Cr-Si-B are demonstrated to have a low Curie temperature (below 90oC) and pronounced temperaturedependentmagnetic properties and GMI effect. Both families of developed microwires are foreseenfor applications in high performance stress and temperature sensors as well as in tuneable sensorycomposite materials. Such composites contain short pieces of microwires embedded into adielectric matrix and contribute to the effective ac permittivity. The latter depends on the wiremagnetic properties through the GMI effect and can be tailored to produce a microwave responsesensitive to environment: magnetic field, stress and temperature
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.54.180.pdf
