Abstract
Fe20Ni80 alloy nanotubes with different lengths of 3 μm, 6 μm, 9 μm, 12 μm and with “caps” were formed using template synthesis in the pores of PET membranes. The “caps” begin to form over individual nanostructures due to uneven growth, when some tubes reach the template surface before the others at the end of active growth stage. The influence of growth mechanism at different formation stages on the nanotube structure and morphology as well as the correlation between their structural properties and magnetic behavior of arrays were comprehensively studied. The structural parameters (crystallinity degree, lattice parameter and microstresses) were demonstrated as a dependence on the nanotubes length. The structural and magnetic correlations with the processes taking place at various stages of nanotubes evolving from nucleation to active growth and to “caps” formation were analyzed. With increasing the nanotube length, the magnetization reversals in parallel and perpendicular magnetic field directions substantially differ which is explained by the formation of easy anisotropy direction of a helical type. The considerable contribution of “caps” to the magnetic properties of nanotubes was demonstrated for the first time.
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