Dzhelepov Laboratory of Nuclear Problems

Date and Time: Thursday, 24 December 2020, at 11:30 AM

Venue: Online conference in Zoom

Seminar topic: “μSR-Study of a Ferrofluid with the 3% Concentration of CoFe₂O₄ Nanoparticles”

Authors: M. Balasoiu^2,3, D. Buzatu⁴, S. I. Vorobiev¹, A. L. Getalov¹, K. I. Gritsai², V. N. Duginov², E. N. Komarov¹, S. A. Kotov¹, K. Stan⁴, G. V. Shcherbakov¹

1 – National Research Center “Kurchatov Institute” – Petersburg Nuclear Physics Institute, Gatchina, Russia
2 – Joint Institute for Nuclear Research, Dubna, Moscow region, Russia
3 – Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania
4 – Politehnica University, Bucharest, Romania

Speaker: Victor Duginov

Abstract:

A ferrofluid based on magnetic nanoparticles of CoFe₂O₄ molecules dispersed in H₂O with the nanoparticle concentration of 3% is studied using the μSR method. The structure and magnetization of the ferrofluid depends on its viscosity. At room temperature (290 K) and the external magnetic field of 527 Gs the observed additional magnetization is ~20 Gs. A small fraction of the sample (~20%) shows negative magnetization (diamagnetism). At a low temperature (~30 K) the sample in the magnetic field behaves like a paramagnet. The magnetic field inside and in the near vicinity of the CoFe₂O₄ nanoparticle is found to be 1.96 ± 0.44 kGs.

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