Investigations of Magnetic Properties of Apg 513a Magnetic Fluid

• Autorzy: Hornowski T. , Skumiel A. , Łabowski M.
• Języki publikacji: EN

Abstrakty

EN

Static magnetic properties of magnetic fluid APG 513A have been measured. The differential magnetic susceptibility was measured as a function of an external magnetic field in the range of 1-200 kA/m, parallel to the direction of the field. The data were analysed using the Langevin equation and taking into account polydispersity of a system. A lognormal function was used as to approximate the distribution function of the size of magnetic particles. On the basis of the least-square fit of the susceptibility data to the Langevin equation the parameters of the distribution function as well as macroscopic parameters of the ferrofluid such as the initial susceptibility, saturation magnetization and particle number density were obtained. In magneto-granulometric analysis of the ferrofluid the mean magnetic diameter and standard deviation of particles were obtained. The agreement between the susceptibility data and the Langevin equation predictions is very good, which suggests the lack of interactions between particles and the absence of agglomerates in the ferrofluid studied.

Słowa kluczowe

EN

magnetic liquids; magnetization curve; ultrasonic attenuation

• Wydawca: Silesian Division of Polish Acoustical Society
• Czasopismo: Molecular and Quantum Acoustics
• Rocznik: 2004
• Tom: Vol. 25
• Strony: 115--120
• Opis fizyczny: Bibliogr. 6 poz., rys.

Twórcy

autor

Hornowski T.

• Institute of Acoustics, Adam Mickiewicz University ul. Umultowska 85, 61-614 Poznań

autor

Skumiel A.

• Institute of Acoustics, Adam Mickiewicz University ul. Umultowska 85, 61-614 Poznań

autor

Łabowski M.

• Institute of Acoustics, Adam Mickiewicz University ul. Umultowska 85, 61-614 Poznań

Bibliografia

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• 4. E. Blums, A. Cerbers, M. M. Maiorov, Magnetic field, Walter de Gruyter, Berlin-New York, 1997.
• 5. A.F. Pshenichnikov, V.V. Mekhonoshin, A.V. Lebedev, J. Magn. Magn. Matter, 161, 94 (1996).
• 6. M. Rasa, Eur. Phys., 2, 265 (2000).