Ultrasonic propagation characteristics of a magnetic fluid under AC magnetic fields

Issue title: Proceedings from the 16th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2013)

Guest editors: Xavier Maldague and Toshiyuki Takagi

Article type: Research Article

Authors: Fujita, Y.^a | Isnikurniawan, A.^a | Tanimoto, S.^a | Sawada, T.^{a; *}

Affiliations: [a] Department of Mechanical Engineering, Keio University, Hiyoshi, Yokohama, Japan | Université Laval, Canada | Tohoku University, Japan

Correspondence: [*] Corresponding author: T. Sawada, Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Yokohama 223-8522, Japan. E-mail: sawada@mech.keio.ac.jp

Abstract: An experimental study in ultrasonic propagation characteristics of a magnetic fluid under AC magnetic fields was conducted. Sound velocities in a magnetic fluid increased with elapsed time of the AC magnetic fields. Moreover, rapid decreases in sound velocities in a magnetic fluid were observed when the AC magnetic fields were stopped. These results were similar to those for DC magnetic fields. Dependence of frequencies and magnitudes of AC magnetic fields on sound velocities in a magnetic fluid was observed. Moreover, anisotropy was found in each frequency of the AC magnetic fields.

Keywords: Magnetic fluid, ultrasonic, AC magnetic field, anisotropy

DOI: 10.3233/JAE-141891

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 667-673, 2014