AC Magnetic Susceptibility of Ferrofluids Exposed to an External Electric Field

• Authors: M. Rajňák , B. Dolník , J. Kováč , K. Paulovičová , Z. Mitróová , J. Kurimský , R. Cimbala , P. Kopčanský , M. Timko
• Languages of publication: EN

Abstracts

EN

It is known that ferrofluid superparamagnetic nanoparticles response to external magnetic fields, often resulting in the formation of elongated clusters along the field. This has a notable impact on dielectric properties of ferrofluids. Here we report on indications of a contrary effect when the magnetic susceptibility of ferrofluids based on transformer oil is influenced by an external electric field. This effect is associated with structural changes in the ferrofluids induced by the external electric fields. Particularly, we focus on a steady state electric field effect, which gives rise to forces acting on the magnetite nanoparticles, leading to the formation of aggregates. In this condition we have measured the ferrofluid AC magnetic susceptibility in parallel and perpendicular configuration of magnetic and electric fields at room temperature. The measurements in both configurations yielded a noticeable decrease in the real susceptibility values with increasing electric field intensity. The result is believed to be caused by the reduction in the total magnetic moment of the ferrofluid. This can be a consequence of the superspin interactions in the aggregates, minimizing the aggregate's energy. Finally, we highlight the necessity of NMR and small angle scattering of polarized neutrons investigations in order to obtain exact information on the magnetic structure induced by the electric forces.

Keywords

EN

47.65.Cb; 75.75.Fk; 75.78.-n; 83.60.Np

Discipline

• 47.65.Cb: Magnetic fluids and ferrofluids
• 83.60.Np: Effects of electric and magnetic fields
• 75.75.Fk: Domain structures in nanoparticles
• 75.78.-n: Magnetization dynamics

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 887-889

Dates

published

2017-04

Contributors

author

M. Rajňák

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia
• Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia

author

B. Dolník

• Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia

author

J. Kováč

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

K. Paulovičová

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

Z. Mitróová

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

J. Kurimský

• Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia

author

R. Cimbala

• Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia

author

P. Kopčanský

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

M. Timko

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

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Identifiers

DOI

10.12693/APhysPolA.131.887