Temperature and field dependences of magnetic fluid's shear viscosity: Decoupling inputs from a carrier fluid and magnetic nanoparticles

In this work, we report a multifaceted investigation of the magnetoviscous effect for a magnetic fluid cylinder locked in a tube by an inhomogeneous magnetic field and exhibiting damped oscillations. It is shown that the acquisition of viscosity elevation should take into account not only the magnetic field strength but also the system's temperature and the rate of oscillations due to their significant influence on the carrier's viscosity including non-Newtonian properties of the colloidal system of magnetic nanoparticles even in absence of the external magnetic field. The part of the viscosity change that originated from the interaction with the magnetic field is determined explicitly. The perspectives of the oscillatory method for determining the characteristics of ferrofluids are discussed. •Characterizing properties of a magnetic fluid by experimental oscillator.•Components of viscosity originated from carries medium and magnetic particles.•Distinguishing between temperature and magnetoviscous effects.•Improved formula for demagnetising factor.