Osobennosti povedeniya linii epr (<i>g </i>≈ 4<i>.</i>3) v magnitnykh nanogranulyarnykh kompozitakh

Author:

Drovosekov A. B1,Kreynes N. M1,Ziganurov D. A12,Sitnikov A. V34,Nikolaev S. N4,Ryl'kov V. V45

Affiliation:

1. Kapitza Institute for Physical Problems, Russian Academy of Sciences

2. National Research University Higher School of Economics

3. Voronezh State Technical University

4. National Research Centre Kurchatov Institute

5. Kotelnikov Institute of Radio Engineering and Electronics, Fryazino Branch, Russian Academy of Sciences

Abstract

Films of metal-insulator nanogranular composites MxD100 – x with different composition and percentage of metal and dielectric phases (M = Fe, Co, CoFeB; D = Al2O3, SiO2, LiNbO3; x ≈ 15–70 at %) are investigated by magnetic resonance in a wide range of frequencies (f = 7–37 GHz) and temperatures (T = 4.2–360 K). In addition to the usual ferromagnetic resonance signal from an array of nanogranules, the experimental spectra contain an additional absorption peak, which we associate with the electron paramagnetic resonance (EPR) of Fe and Co ions dispersed in the insulating space between the granules. In contrast to the traditional EPR of Fe and Co ions in weakly doped non-magnetic matrices, the observed peak demonstrates a number of unusual properties, which we explain by the presence of magnetic interactions between ions and granules.

Publisher

The Russian Academy of Sciences

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