The experimental apparatus of vibration system consisted of two parts: a data acquisition system and a vibration table, as shown in Fig. . The data acquisition system had a laser displacement sensor, an amplifier and an acquisition card. The resolution of the laser displacement sensor IL-030 was 2.5 𝜇𝑚 , which ensured the experiment accuracy. The amplifier IL-1000 displayed the displacement value of the end of the brass plate momently. The acquisition card USB-DAQ-7606i collected electrical signals with sampling frequency of 50 Hz and transmitted them to the computer. The data acquisition system was supplied 10V voltage by the DC power source. The main body of the vibration table was the base and the holder. Meanwhile, the vibration table included two non-magnetic supports, one for fixing the brass plate and the other for fixing the laser displacement sensor. The small amplitude and low frequency vibrations were generated by the cantilever elastic brass plate. The size of the brass plate was 1200mm*50mm*5mm and its free end was fixed with a non-magnetic frame for installing the MFSA. The amplitude of free oscillations of the brass plate could be changed from 1 to 10 mm and the frequency of that was equal to 1.1 Hz. The viscosity and density of the ester-based MF were 0.27 Pa s and 1.07 g/cm 3 respectively, which was produced by our laboratory.