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μSR study of the properties of Fe3O4-based nanostructured magnetic systems

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Abstract

A ferrofluid based on Fe3O4 nanoparticles dispersed in heavy water D2O is studied using the μSR method. The experiment has been carried out at temperatures 26–300 K. It is found that the diamagnetic (muon) fraction is formed in the ferrofluid in about the same amount as in D2O, but the muon-spin relaxation rate in the ferrofluid is much higher than in D2O. A significant shift of the muon-spin precession frequency in the ferrofluid is observed. It is shown that the shift of the muon precession frequency as a function of the external magnetic field is described by the Langevin function typical of paramagnetic magnetization. The mean magnetic field in the medium due to magnetic-nanoparticle polarization in an external field is experimentally determined. The nanoparticle sizes are estimated.

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Correspondence to V. N. Duginov.

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Original Russian Text © M. Balasoiu, S.G. Barsov, D. Bica, L. Vekas, S.I. Vorob’ev, K.I. Gritsaj, V.N. Duginov, V.A. Zhukov, E.N. Komarov, V.P. Koptev, S.A. Kotov, T.N. Mamedov, C. Petrescu, G.V. Shcherbakov, 2008, published in Pis’ma v Zhurnal ’Eksperimental’noĭ i Teoreticheskoĭ Fiziki, 2008, Vol. 88, No. 3, pp. 243–247.

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Balasoiu, M., Barsov, S.G., Bica, D. et al. μSR study of the properties of Fe3O4-based nanostructured magnetic systems. Jetp Lett. 88, 210–213 (2008). https://doi.org/10.1134/S0021364008150149

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  • DOI: https://doi.org/10.1134/S0021364008150149

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