In telecommunication systems, heavy bulky magnets are used to establish the proper functioning of a circulator by ensuring the uniform orientation of the ferrite material"s magnetic moments. Thus to develop an unbiase...
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In telecommunication systems, heavy bulky magnets are used to establish the proper functioning of a circulator by ensuring the uniform orientation of the ferrite material"s magnetic moments. Thus to develop an unbiased coplanar microwave circulator, the approach based on "ferromagnetic nano-wired composite substrates" was promising. The idea was to do a magnetophoretic deposition of nano-colloidal cobalt ferrite nanoparticles into porous alumina membranes and permanently orient them uniformly. Therefore, in order to check the orientation possibility of the nanoparticle, samples of magnetic thin films on glass substrates were synthetized from CoFe2 O 4 nanoparticles dispersed in a silica sol-gel matrix using the dip-coating technique with and without a uniformly applied magnetic field. To investigate the magnetic behavior of the prepared samples, the Faraday rotation as a function of the applied magnetic field was measured using a spectral polarimeter. The unambiguous qualitative difference between the Faraday rotation hysteresis loops shows a large variation of coercive (μ 0 H c ) and remanent field (M/M s ) values, thus proving the orientation of the nanoparticles. Such nano-composite was a promising candidate for future miniature microwave circulators fabrication.
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