Nanowires (NWs) of FeNi and FeCo alloys were obtained by matrix synthesis based on galvanic filling of pores in track membranes. The change in the elemental composition of NWs when changing the composition of the electrolyte and when changing the deposition potential was studied. The effect of anomalous co-deposition of Fe is observed in the FeNi NWs: the iron content in the NWs is noticeably higher than that in the electrolyte. This difference increases when the initial concentration increases and when the growth potential decreases. An increase in the concentration of iron at the tops of the wires was also detected. For FeCo NWs, the composition corresponds to the composition of the electrolyte and did not change much when the potential changed. X-ray diffraction analysis allowed to determine the nature of changes in the spectra when the growth conditions change. The dependence of the X - ray spectra of FeNi on the growth potential is found- the intensity of the phase peaks changes. Mössbauer measurements revealed spontaneous magnetization for all samples of NW arrays along their axes. The dependence of the value of the ultrathin magnetic field Bh f on 57Fe nuclei on the composition of NWs (FexCo1−x and FexNi1−x) was obtained for the first time. It was found that the value of Bh f decreases with an increase in the speed of the electrodeposition process (or with an increase in the value of the deposition potential U).

Several types of nanowires (NWs) made of alloys of various compositions obtained by the method of matrix synthesis based on track membranes have been studied. Electrolytes were selected to obtain NWs of the desired composition. The control of electrodeposition by chronoamperograms made it possible to systematically change the geometric parameters and morphology. The topographies of the resulting NW arrays and their elemental composition were studied using electron microscopy with an X-ray spectral analyzer. The magnetic properties of the samples were studied on a vibrating magnetometer. The structures of binary alloys were studied: for NWs of FeCo alloys, the dependence of the coercive force on the composition was studied. The obtained dependence has two maxima - at an equiatomic composition and at a cobalt content of about 90%. For Fe0.3Co0.7 NWs, a sharp increase in the coercive force with decreasing diameter is shown. It is assumed that this effect is due to the formation of single-domain crystallites, the processes of magnetization reversal of which are associated with a uniform rotation of the magnetization. For NWs made of FeNi alloys, the influence of the aspect ratio on the coercive force has been proved. Ternary alloys of the FeCoCu system have been studied: it has been shown that the addition of copper significantly increases the coercive force, which reaches a maximum at a copper content of about 5%. The obtained X-ray data suggest that the effect of an increase in the coercive force is associated with the formation of fine-grained inclusions based on copper, which lead to effective deceleration of the domain walls. The data obtained expand the range of possibilities for controlling the magnetic properties of NW arrays obtained by the method of matrix synthesis. Keywords: nanowires, matrix synthesis, microscopy, elemental analysis, magnetic properties, coercive force.

XXVIII Российская конференция по электронной микроскопии VI школа молодых учёных Программный комитет Авилов А.С.-председатель (ФНИЦ «Кристаллография и фотоника» РАН) Васильев А.Л.-зам. председателя (НИЦ «КИ») Якимов Е.Б.-зам. председателя (ИПТМ РАН) Аронин А.С.