Структура и магнитные свойства слоевых нанопроволок из 3d-металлов, полученных методом матричного синтеза

Abstract

Arrays of layered nanowires (NWs) with a diameter of 100 nm consisting of alternating layers of Ni/Cu and Co/Cu were obtained by matrix synthesis based on polyethylene terephthalate track etched membranes. The process of galvanic deposition was studied and the regimes of obtaining of layered nanowires with different thicknesses of magnetic (Ni or Co) and non-magnetic (Cu) components of layers were determined. Electron microscopic investigation was performed to verify regimes of obtaining of layered nanowires and to refine the geometric properties of alternating layers. Using vibration magnetometer, the magnetization curves of the obtained arrays of layered NWs was measured at room temperature for two limiting orientations of the scanning magnetic field: parallel and perpendicular to the growth axis of the NW. It is shown that the magnetic anisotropy of the NW array is determined not only by the chemical composition, but also by the thickness and period of alternating magnetic layers in the NW. Numerical calculations of the dependence of the magnetostatic energy and the magnitude of the demagnetizing field in the synthesized layered NWs on the factor of their filling with a magnetic metal are carried out, which are qualitatively consistent with experimental observations.