ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
The discovery of the magnetoimpedance (MI) effect in 1994 had a strongimpact on the development of magnetic sensors, offering miniature, highly sensitive, andquick response elements. Along with traditional areas of sensing applications (data storage,bio-medical electronics, robotics and security), the MI elements have a high potential fornon-destructive testing (as eddy current probes) and smart sensory systems (self-sensingcomposites). In certain soft magnetic materials, such as composites of amorphous thin wires,the impedance change (MI ratio) can be as high as 600 % in the MHz band and 50-100% atGHz frequencies subjected to small magnetic fields or stresses. Furthermore, special thin-filmstructures have been proposed to improve the MI performance in miniature elements. Thispaper discusses physical concepts of MI in multilayered structures including MI ratioenhancement and effect of anisotropy, experimental results proving high sensitivity to theexternal stimuli for excitation frequencies up to few GHz, practical sensor designs and,finally, the use of MI fibers for tagging the composites to build-in sensing functionality
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.54.29.pdf
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