Dvoretskaya E. V.1, Valeev R. A.2, Burkanov M. V.2, Morgunov R. B.1,2,3
1Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS, Сhernogolovka, Russia
2All-Russian Scientific Research Institute of Aviation Materials of the Research Center "Kurchatov Institute", Moscow, Russia
3Tambov State Technical University, Tambov, Russia
Email: Dvoretskaya95@yandex.ru
The magnetic properties of a nanonetwork consisting of ultrathin Ni nanowires (diameter <4 nm) and Ni nanoballs (diameter <20 nm) are studied at different stages of its growth during laser ablation in a superfluid helium medium. It has been established that, at the early stages of ablation, the nanonetwork consists mainly of nanowires and has a rectangular magnetic hysteresis loop. At the late stages of ablation, the concentration of nanoballs and their diameter increase, and the shape of the hysteresis loop deviates from a rectangular one. The fractal dimension of the nanonetwork is determined, which varies from 1 in the early stages of ablation, when individual nanowires occur, to 2, when the nanonetwork becomes so dense that it is a continuous film. It is shown that the saturation magnetization changes with a change in the fractality of the nanonetwork, which, under constant ablation conditions, is explained by the transformation of nanowires into nanoballs during their folding Keywords: Ni nanowires, laser ablation, magnetic anisotropy, fractal dimension.
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