Using Raman Spectroscopy to Study Magnetobacteria

Abstract

In the article, using the method of Raman spectroscopy, a comparison was made of the magnetic properties and structure of natural and artificial magnetic nanoparticles (MNPs). The morphology, composition and magnetic properties of MNPs from the bacterium Geoalkalibacter ferrihydriticus were studied. The magnetic properties of the sample are determined mainly by MNP aggregates and are: specific magnetization, 2.7σs A · m²/kg, and magnetization coercive force 31.8 kA/m. On the other hand, the magnetization of the artificial magnetic NP was: specific magnetization 69.7σs A · m²/kg, and coercive magnetization force 5.3 kA/m. So, the value of the specific magnetization of a bacterium is 25.8 times less than the specific magnetization of an artificial NP, and the coercive magnetization force of a bacterium is 6 times greater than that of an artificial NP. It is likely that the reason for the decrease in the JH_b /JH_MNPs ratio may be the partial oxidation of MNPs. According to the authors, the structure of bacterial MNPs is close to the structure of Fe₃OP₄Gd₃ (the bands at 250, 350, 950 cm^--1 correspond to the characteristic Raman spectrum bands of 247, 350 and 950 cm^--1 in the region where bacterial MNPs accumulate)

Please cite this article in English as:

Savchenko A.G., Shutova V.V., Maksimov G.V., et al. Using Raman spectroscopy to study magnetobacteria. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2025, no. 2 (119), pp. 78--92 (in Russ.). EDN: KYXDAA

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