Specific Features of Synthesis, Structure, Magnetometry, and NMR Spectroscopy of Different-Type Nanowires

Zagorskii, D.L.; Doludenko, I.M.; Khaibullin, R.I.; Chuprakov, S.A.; Gippius, A.A.; Zhurenko, S.V.; Tkachev, A.V.; Cherkasov, D.A.; Zhigalina, O.M.; Khmelenin, D.N.; Kanevskii, V.M.; Muslimov, A.E.; Panov, D.V.; Blinov, I.V.

Авторы: Zagorskii D.L., Doludenko I.M., Khaibullin R.I., Chuprakov S.A., Gippius A.A., Zhurenko S.V., Tkachev A.V., Cherkasov D.A., Zhigalina O.M., Khmelenin D.N., Kanevskii V.M., Muslimov A.E., Panov D.V., Blinov I.V.
Журнал: Physics of the Solid State
Год издания: 2022
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
DOI: 10.1134/s1063783422060087
Аннотация: Nanowires of different types (homogeneous (made of iron) and heterogeneous (layered)), obtained by the template synthesis method, have been investigated. A technique for preparation of layered nanowire arrays with alternating thin layers of magnetic and nonmagnetic metals (Co/Cu and Ni/Cu) has been developed and described. Microscopy methods (SEM and TEM with elemental analysis) are used to study topography of the obtained structures, nanowire diameters, individual-layer thicknesses, and specific features of layer interfaces. Several ways of synthesis of nanowires with thin layers and sharp interfaces are proposed: dilution of electrolyte, use of a reference electrode, and monitoring of the charge passage. Layered nanowires are investigated by magnetometry; it is shown that the magnetic properties of a layered nanowire array (in particular, direction of the easy magnetization axis in the Co/Cu nanowire array) depend not only on the aspect ratio of the magnetic layer but also on the thickness ratio between the magnetic-metal layer and the nonmagnetic spacer (copper interlayer). Nanowires of the two types are studied using the nuclear magnetic resonance (NMR) method. Layered Co/Cu structures are analyzed by 59Co NMR: it is shown that nanowires with smaller-thickness layers (and, accordingly, with a larger contribution from the interfaces) are characterized by a larger fraction of Co atoms coordinated by Cu atoms. The large fraction of the Cu-coordinated atoms suggests that copper impurity enters cobalt layers. Homogeneous nanowires made of iron are compared with bulk iron samples (57Fe NMR). The line is found to be shifted to higher frequencies (by 0.3 MHz), which is indicative of an increase in the field by about 0.2 T. A significant line broadening and a decrease in the spin–lattice relaxation time may indicate that there is a large dispersion between the local magnetic field values.
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Specific Features of Synthesis, Structure, Magnetometry, and NMR Spectroscopy of Different-Type Nanowiresстатья

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