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1 Molecular and Quantum Acoustics

1 2003

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Effects of Magnetic Field Decay Time on the Hysteresis of Ultrasonic Wave Attenaution on Ferrofluid

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Józefczak A. , Skumiel A.

2003

tom Vol. 24

89-96

Acoustic properities of a ferrofluid subject to an external magnetic filed depend on the sweep rate. The magnetic filed determines the mode and degree of aggregations of the magnetic particles and their association into chain-like clusters. After the removal of the filed the ferrofluid does not return to the original state as indicated by the ultrasound wave propagation study, in particular by changes in the ultrasonic wave absorption coefficient. A hysteresis of the ultrasonic wave absorption coefficient has been observed. The hysteresis depends on the rate of the magnetic field intensity decay. The effect of the hysteresis on the acoustic properities of the ferrofluid has been studied.