Magnetic and structural properties iron oxide micro- and nanoparticles and composites based on epoxy resin at different mass concentrations of particles are investigated (0, 5, 10, 30%). Commercial Alfa Aesar microparticles and nanoparticles obtained by electric explosion of wire with different dispersion parameters were compared. Magnetoimpedance detection of stray magnetic fields of the obtained composites in the form of cylinders using a strip multilayer film element [FeNi/Cu]5/Cu/[FeNi/Cu]5 was carried out. It is shown that it is possible to determine the position of filled magnetic composites at different mass concentrations of magnetic micro- or nanoparticles with different parameters of dispersion of the ensemble using magnetoimpedance detection.
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Longitudinal giant magnetoimpedance effect of [Fe21Ni79/Cu]5/Cu/[Fe21Ni79/Cu]5 film element was investigated depends on stray magnetic field of epoxy magnetic composite with 30 % weight concentration of iron oxide magnetic microparticles. Configuration of an experiment was a model of thrombus detection in a blood vessel. Stray magnetic field was varied by movement of a magnetic composite above the element perpendicular to the long side. Composite was either magnetized or not to the state of remanence. As the magnetic composite approaches the GMI element, MI ratio curves are smoothed and shifted along the field axis and maximum value of the MI ratio decreases. Magnetic properties of magnetic composite and film element were investigated as well.
Планарные ансамбли многослойных периодических квадратных микроэлементов типа [Cu(6 nm)/FeNi(100 nm)]5 были получены методом ионно-плазменного распыления на стеклянные подложки с использованием сетчатых медных масок. Особенности поверхности микроэлементов анализировались с помощью стилусного профилометра, оптической и сканирующей электронной микроскопии. Статические магнитные свойства и особенности магнитной доменной структуры исследовались с использованием магнитооптического Керр-эффекта. Полученные планарные ансамбли могут использоваться как составная часть пленочных элементов детекторов слабых магнитных полей, работающих на основе магнитного импеданса (МИ), для повышения чувствительности МИ отклика к внешнему магнитному полю. Ключевые слова: многослойные пленочные структуры, ансамбли микроэлементов, периодические структуры, гигантский магнитоимпедансный эффект.
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