DocumentCode
967102
Title
Magnetic field dependence of ultrasonic response times in ferrofluids
Author
Chung, David Y. ; Isler, William E.
Author_Institution
Howard University, Wash, D.C.
Volume
14
Issue
5
fYear
1978
fDate
9/1/1978 12:00:00 AM
Firstpage
984
Lastpage
986
Abstract
A continuous wave method has been used to investigate the influence of a magnetic field upon the ultrasonic response times in a water-base ferrofluid. Values of response times as long as several seconds were observed. Measurements were made of response times versus field angle at 2.262 MHz and at 830 KHz. It was found that the response time is a strong function of the field angle; also it was unusually long at some angles of rotation. This long reponse time was interpreted as an indication of the formation of larger agglomerate or needle-shaped structures due to the external magnetic field. It was concluded that ultrasonic measurements can he a powerful tool for studying the dynamics of ferrofluids under the action of an external magnetic field.
Keywords
Acoustic measurements; Magnetic liquids; Delay; Magnetic anisotropy; Magnetic field measurement; Magnetic fields; Magnetic liquids; Perpendicular magnetic anisotropy; Physics; Pulse measurements; Ultrasonic variables measurement; Velocity measurement;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/TMAG.1978.1059905
Filename
1059905
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