In this report, Co–Pt nanowires (NWs) were produced via potentiostatic electrodeposition into
commonly used commercial ordered-alumina and disordered-polycarbonate membranes with
similar pore diameters (≈200 nm). The pore diameter of the membranes and the deposition
conditions were chosen such that the Co–Pt NWs fabricated into both membranes had a
hexagonal close packed (hcp) crystal structure with a crystallographic texturing of the c-axis
in the direction perpendicular to the NWs’ long axis; this effect was more pronounced in
the alumina membranes. Due to the local fluctuation in electrodeposition conditions (pore
diameter, pore shape), we have found a small variation in the c-axis orientations in the plane
perpendicular to the NWs’ long axis. Magnetic characterizations suggested that there is
uniaxial anisotropy perpendicular to the Co–Pt NWs’ long axis and the small variation in the
orientation of the hcp c-axis plays an important role in the switching-field distribution and the
magnetic domain structure of the Co–Pt NWs. First order reversal curves (FORCs) revealed
week magnetostatic interactions between Co–Pt NWs, thus suggesting that the different
pore alignments are not influencing much the magnetic properties in both membranes. The
micromagnetic simulation revealed that the transverse-stripe (TS) and longitudinal stripe (LS)
domains are energetically most favorable structures in such NWs. This study accentuates the
influence of the crystal orientation (c-axis) of the high-anisotropy materials on their functional
magnetic properties and thus is of great importance for the fabrication of nanodevices based
on such NWs.

full article can be found here

http://iopscience.iop.org/article/10.1088/0022-3727/49/18/185006/meta