Abstract—
We have separately assessed the contributions of isolated Fe3+ ions and the ferrimagnetic subsystem to the total magnetization of an aligned magnetite (Fe3O4) nanowire array grown in pores of an anodized alumina membrane and evaluated the magnetic anisotropy field of the nanowires, which has been found to be an order of magnitude weaker than the expected shape anisotropy field. The reduction in magnetic anisotropy in the nanowires can be accounted for by dipole–dipole interaction between individual nanowires in the array. In electron spin resonance spectra of the nanowires, we have identified a phase-inverted line, corresponding to their microwave magnetoresistance. The Verwey transition in the magnetite nanowires has been shown to be suppressed due to deviations from stoichiometry and size effects.
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ACKNOWLEDGMENTS
In this work, we used equipment at the Shared Analytical Facilities Center, Institute of Problems of Chemical Physics, Russian Academy of Sciences. We are grateful to O.L. Kazakova for providing the nanowire samples and electron micrographs.
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Translated by O. Tsarev
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Dmitriev, A.I., Alekseev, S.I. & Kostyuchenko, S.A. Magnetic Properties and Electronic Conductivity of Fe3O4 Magnetite Nanowires. Inorg Mater 55, 576–581 (2019). https://doi.org/10.1134/S0020168519060037
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DOI: https://doi.org/10.1134/S0020168519060037