Study of Faraday effect on Co1-xZnxFe2O4 nanoferrofluids

Abstract

Zinc doped cobalt ferriteCo 1−x ZnxFe 2 O 4 nanoparticles (x = 0.1, 0.5, 0.9) were synthesized by chemical co-precipitation method. The crystallite size, which was calculated from the full width half maximum (FWHM) value of the strongest peak (311) plane using Scherer approximation, was found to decrease with higher zinc content. The surface morphology of the powder samples was obtained using transmission electron microscopy (TEM). Magnetic properties, such as Saturation magnetization (Ms), Remanent Magnetization (Mr) and Coercivity of the powder samples, were measured using Vibrating Sample Magnetometer (VSM) at room temperature and were found to decrease with increased zinc content. Aqueous ferrofluids prepared from the powder samples were subjected to magnetic field to measure their Faraday rotation. Faraday rotation of the ferrofluids was found to increase with applied magnetic field and decrease with increasing zinc composition.

Formation of cobalt ferrite nanopowders in an impinging-jets microreactor

“…Nanocrystalline ferrite powders including cobalt ferrite powder are potentially widely used in medicine [1][2][3][4][5][6][7][8], catalysis [8][9][10][11][12][13], electronics, power industry and in other fields of engineering and technology [14][15][16][17][18][19][20][21][22]. For nanoparticles to be effectively used, as a rule, they should have not only small size but also quite narrow size distribution [3-5, 16, 23].…”

“…Therefore, it is of interest to study the formation processes of nanocrystalline cobalt-ferrite-based powder allowing the creation of slightly agglomerated crystalline nanoparticles with a narrow size distribution. Methods belonging to the group of "soft chemistry" techniques are often used for these purposes [13][14][15][16][17][18][19][24][25][26][27][28][29][30][31][32][33][34]. A method for combined hydrothermal and microwave treatment of hydroxides [31][32][33][34][35] is one of the promising methods for the synthesis of nanosized powders; when this method is used, the hydrothermal medium is heated due to exposure to the microwave radiation.…”

Phase composition and magnetic properties of Ni1-xCoxFe2O4 nanocrystals with spinel structure, synthesized by Co-precipiation

“…The magnetic and electrical characteristics of these ferrites depend on their chemical composition, cation location, particle size, dopant content and the synthesis method [1][2][3][4][5][6][7][8][9]. CoFe 2 O 4 is hard magnetic ferrite with a high coercive force H c > 1500 Oe, with an average saturation magnetization of M s ∼ 40 emu/g [10].…”