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Н. А. Дудченко, А. Б. Брик, В. Л. Карбовский, Н. Н. Багмут, Ю. В. Карданец
«Магнитные нити из наночастиц магнетита и их свойства по данным ферромагнитного резонанса»
PACS numbers: 61.05.Qr, 75.50.Gg, 75.75.Cd, 81.07.Wx, 87.61.Bj, 87.80.Lg, 87.64.M-
Technology is developed to fabricate magnetic threads made of magnetite nanoparticles in agarose gel, using magnetic field. Samples of magnetic threads and ‘disordered’ samples are fabricated in the range of nanomagnetite concentrations 0.5–0.0025 mg/ml. As shown, using optical microscopy, in the samples of magnetic threads, the length of thread considerably exceeds its width, while the aggregates of nanoparticles of less size appear in ‘disordered’ samples. As shown by means of FMR, the samples of magnetic threads are anisotropic. Narrow enough FMR spectra are registered by orientation of magnetic threads parallel to the spectrometer magnetic field, while the orientation of magnetic threads perpendicular to the spectrometer magnetic field leads to a strong broadening of the spectra. The form and position of spectra of magnetic threads oriented perpendicular to the spectrometer magnetic field are similar to the form and position of spectra of ‘disordered’ samples. The maximum of absorption line of the spectra of magnetic threads lies in low fields, whereas maximum of absorption line of the spectra of ‘disordered’ samples lies in higher fields.