Spin Exchange d-f Interaction in Impedance Spectrum
| Authors | K.A. Korotkov1 , VV. Netyaga1, Yu.O. Shkurdoda2 , A.I. Dmitriev1 |
| Affiliations |
1Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv-142, Ukraine 2Sumy State University, 40007 Sumy, Ukraine |
| Е-mail | k.korotkov@ipms.kyiv.ua |
| Issue | Volume 17, Year 2025, Number 5 |
| Dates | Received 23 July 2025; revised manuscript received 24 October 2025; published online 30 October 2025 |
| Citation | K.A. Korotkov, VV. Netyaga, et al., J. Nano- Electron. Phys. 17 No 5, 05021 (2025) |
| DOI | https://doi.org/10.21272/jnep.17(5).05021 |
| PACS Number(s) | 73.20. – r |
| Keywords | Impedance spectroscopy (4) , Oxide nanofilms, Fe (288) , Gd2O3 (2) , d-f exchange interaction. |
| Annotation |
The experimentally observed decrease in the values of the reflection R(f) for Fe/Gd2O3 nanostructures is due to the influence of the d-f exchange interaction. These changes make Fe/Gd2O3 nanostructures suitable for use in modulation polarimetry, resonator systems, and stealth technologies. The impedance spectroscopy of Fe nanofilms grown on Gd2O3 and silica glass (SiO2) substrates in the frequency range of 0-107 Hz has been investigated. As the thickness of Fe nanofilms increases, their morphology changes from nanodot to labyrinth to percolation, consisting of iron islands that provide the percolation mechanism of conductivity. The complex morphology of foils is the source of the and capacitive components of the imaginary part of the impedance. The hodographs and corresponding equivalent circuits of nanofilms are analyzed. The comparison for Fe/SiO2 and for Fe/Gd2O3 shows the closeness of their basic characteristics of dependence on h. The differences lie in the numerical values of the parameters. The latter are a function of the kinetic properties of the films and the influence of the d-f exchange interaction. In the frequency range f 105 Hz, the ε(f) dependences show a peculiarity in the form of a maximum. The formation of this peak is probably related to the spin noise effect. The spin noise effect is characteristic for films with tunneling conductivity. |
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List of References |
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