We have fabricated Co–Pt cylindrical nanostructures comprised of a pair of nanotube and nanowire segments via direct
electroplating into anodic alumina (AAO) membranes. The fabrication of such nanostructures is possible due to the penetration of sputtered gold (Au) nanoparticles inside the template, which serve as nucleation spots. The current transient monitored during the deposition process allowed us to distinguish between the nanotube and nanowire formation regime during the electrodeposition. In this paper, we report on the systematic changes in the angular dependence of the coercivity behavior due to the change in the length of the nanowire segment of these nanostructures, while keeping the nanotube segment constant. Considering the range of parameters studied, we found that the tube segment always reverses its magnetization through a vortex domain wall, whereas the nanowire segment reverses its magnetization through a transverse domain wall. Our results are in good agreement with literature. The possibility to alter the magnetization reversal mode in such nanostructures provides an attractive way to control the motion of the magnetic domain walls.

full text can be found in following

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=6971418

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

mine

https://www.researchgate.net/profile/Muhammad_Shahid_Arshad

whats yours?????