Magnetic properties and anisotropy of ultrasound attenuation in APG-832 magnetic liquid

The results of the ultrasonic and magnetic investigations of APG-832 magnetic liquid are
presented. The magnetic measurements were carried out with the aid of a vibrating sample
magnetometer (VSM). On the basis of the magnetization curve, the coercive field strength, saturation
magnetization and initial susceptibility were evaluated. The attenuation of ultrasonic
wave in an APG832 magnetic fluid was studied using the broadband ultrasonic spectroscopy.
In the external magnetic field the anisotropy of a sound attenuation was observed. This effect
is attributed to the translational and rotational motions of the clusters of the colloidal magnetic
particles dispersed in the carrier fluid.