Abstract
High-quality and compact arrays of Ni nanowires with a high ratio (up to 700) were obtained by DC electrochemical deposition into porous anodic alumina membranes with a distance between pores equal to 105 nm. The nanowire arrays were examined using scanning electron microscopy, X-ray diffraction analysis and vibration magnetometry at 300 K and 4.2 K. Microscopic and X-ray diffraction results showed that Ni nanowires are homogeneous, with smooth walls and mostly single-crystalline materials with a 220-oriented growth direction. The magnetic properties of the samples (coercivity and squareness) depend more on the length of the nanowires and the packing factor (the volume fraction of the nanowires in the membrane). It is shown that the dipolar interaction changes the demagnetizing field during a reversal magnetization of the Ni nanowires, and the general effective field of magnetostatic uniaxial shape anisotropy. The effect of magnetostatic interaction between ultra-long nanowires (with an aspect ratio of >500) in samples with a packing factor of ≥37% leads to a reversal magnetization state, in which a “curling”-type model of nanowire behavior is realized.
Highlights
In our previous article [23], we presented the experimental results about the influence of the synthesis conditions on the magnetic behavior of the densely packed arrays of the
The high-ordered MPAA with thicknesses of 55, 65, 75 μm were produced using two-step anodizing in a potentiostatic regime at the (40 ± 2) V voltage
A new electrolyte for the Ni electrodeposition and MPAA pretreatment were used, which significantly sped up the deposition process
Summary
Such material properties in an ultra-small volume (nanoscale clusters, nanowires, nanopillars, and other nanoelements and nanocomposites) differ significantly from the reference data for the bulk materials. In this regard, it is crucial to carry out experimental studies of the obtained nanostructures (nanocomposites) using known diagnostic methods. The control of the structure and physical parameters of the obtained magnetic nanocomposites is a very relevant problem. Another major challenge today is the development of reliable methods for the fabrication of nanomaterials and nanostructures. The primary attention of researchers is focused on the electrochemical synthesis of nanostructures and nanowires (NW) based on them using porous materials as a template
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
