Abstract
Fe-Zr-B amorphous magnetic fluid has been prepared by a chemical reduction method. X-ray diffraction, transmission electron microscope and vibrating sample magnetometer have been utilized for the characterization of the structure, morphology, and magnetic property of Fe-based amorphous magnetic fluids. Besides, the magnetoviscous properties were also investigated. The results indicate that the Fe-Zr-B particles possess a non-crystalline structure with a particle size below 30 nm. The saturation magnetization of the amorphous particles is approximately 55 emu/g, exhibiting extremely low remanent magnetization and coercivity. We also investigated a parameter named Δη*=ηup-ηdown/ηdown, which characterizes the hysteresis effect between viscosity vs magnetic field. The results show that the relatively reduced viscosity △η* is negative below 124 mT, and becomes positive when the magnetic field is higher than 124 mT. We reveal the inverse associations between viscosity and magnetic fields, which can be attributed to the combined influence of thixotropy and magnetic fields. These discoveries present a fresh perspective on the magnetoviscous behavior of magnetic fluids.
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