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31 January 2020 3D inkjet printing of ferrite nanomaterial thin films for magneto-optical devices
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Abstract
A novel method of preparing magnetic ink belonging to the class of ferrofluids which contains magnetic particles with a polar surface-active agent is disclosed. The magnetic material belongs to the group known as magnetite (Fe3O4), typically to those with γ-Fe2O3 and their likes. Ni-Zn ferrite and Mn ferrite inks were prepared using this method. The inks have a PH value and total dissolved solute of about 6.3, 3.78 mS and 5.9, 4.2 mS respectively, and a viscosity of about 7 cPa, 7.4 cPa respectively. The saturation magnetization of Mn ferrite ink at 300K was 62 emu/cm3. This lower value of the saturation magnetization of Mn ferrite compared to the bulk is because of the shell-core structure of the surfactant coated ferrite particles. The inks were used to prepare various thicknesses ranging from 0.5um to 20um of both Ni-Zn ferrite and Mn ferrite thin films. The surface morphology of the thin film was observed using Atomic Force Microscopy (AFM), showing a compact, dense and relatively smooth film. The microstrip transmission line permeameter approach was used to extract the permittivity and permeability of the thin film samples within the frequency range of 10MHz-1GHz. A relative permeability of 2 was measured. The developed ink and thin film are promising for future magneto-optical applications.
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© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Evarestus Enuka, Mahmuda Akter Monne, Xing Lan, Vincent Gambin, Rachel Koltun, and Maggie Yihong Chen "3D inkjet printing of ferrite nanomaterial thin films for magneto-optical devices", Proc. SPIE 11288, Quantum Sensing and Nano Electronics and Photonics XVII, 112881K (31 January 2020); https://doi.org/10.1117/12.2542181
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