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  • 1
    Electronic Resource
    Electronic Resource
    Development of Stress and Temperature Sensitive Microwires for the Sensor Applications and Tuneable Composite Materials (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 54 (Sept. 2008), p. 180-186 
    Details
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Multilayered Magnetic Wires and Films for Electromagnetic Sensor Technology (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 54 (Sept. 2008), p. 29-40 
    Details
    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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  • 3
    Electronic Resource
    Electronic Resource
    Tunable and Self-Sensing Microwave Composite MaterialsIncorporating Ferromagnetic Microwires (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 54 (Sept. 2008), p. 201-210 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: New types of stress sensitive and magnetic field tunable microwave compositematerials are discussed where embedded short ferromagnetic microwire inclusions are used ascontrollable radiative elements. The dc external magnetic field is applied to the whole compositestructure. And, the local stress is transferred to the individual microwires through theaccommodating composite matrix. The spatial and angular distributions of microwires can berandom, partly ordered, or completely ordered. For a wide frequency range, the free-spacemicrowave response of a wire-filled composite can be characterized by a complex effectivepermittivity with resonance frequency dispersion. The latter depends on the conductive andmagnetic properties of the microwire inclusions that contribute to the ac microwiremagnetoimpedance (MI). In the vicinity of the so-called antenna resonance frequency, which isdefined by the length of microwires and matrix dielectric constant, any variations in the MI of themicrowires will result in large changes of the effective permittivity, and hence the reflection andtransmission coefficients for an incident microwave. The field or stress dependence of the effectivepermittivity arises from the corresponding field or stress sensitivity of the MI in the ferromagneticmicrowires with induced circumferential or helical magnetic anisotropy, respectively. The strongfield tunable effect in the proposed composite materials can be utilized to introduce reconfigurablemicrowave properties in coatings, absorbers, and randomizers, and also in new media such asmicrowave metamaterials and bandgap wire structures. A maximum field tunability of 30 dB wasachieved for free-space transmission measurements when the external magnetic field changed fromzero to ~40 Oe. The stress sensitivity of reflection and transmission coefficients opens up newpossibilities for the distant non-destructive testing and evaluation of composite materials both in thelaboratory environment and large scale applications. The stress tunability of transmissioncoefficient may reach up to 5-8 dB within the elastic limit. The reflection coefficient usuallydemonstrates less tunability in both cases (field and stress dependent) and may require a multilayerstructure to achieve better results, but it is always strong enough for the stress sensing applications
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.54.201.pdf
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