Magnetic–optical bifunctional CoPt₃/Co multilayered nanowire arrays

CoPt₃/Co multilayered nanowire (NW) arrays are synthesized by pulsed electrodeposition into nanoporous anodic aluminum oxide (AAO) templates. The electrochemistry deposition parameters are determined by cyclic voltammetry to realize the well control of the ratio of Co to Pt and the length of every segment. The x-ray diffraction (XRD) patterns show that both Co and CoPt₃ NWs exhibit face-centered cubic (fcc) structures. In the UV-visible absorption spectra, CoPt₃/Co NW arrays show a red-shift with respect to pure CoPt₃NWs. Compared with the pure Co nanowire arrays, the CoPt₃/Co multilayered nanowire arrays show a weak shape anisotropy and well-modulated magnetic properties. CoPt₃/Co multilayered nanowires are highly encouraging that new families of bimetallic nanosystems may be developed to meet the needs of nanomaterials in emerging multifunctional nanotechnologies.