 Magnetic nanoparticles suspended in magnetic fluids respond differently depending on the intensity and duration of a magnetic field. When exposed to a magnetic field, these particles form structures that are not uniform and take on various shapes. At higher temperatures, these structures become more organized into long chains aligned with the magnetic field. By studying the acoustic properties of these fluids, we can determine the size and number density of the particles as well as their alignment. This allows us to better understand how temperature affects the structure of the particles and how it influences the acoustic properties of the fluid. This article was authored by Yosef Kutelsik, Peter Berry, Peter Kopkensky, and others.