Artificial control of layer thickness in Co-Pt alloy multilayer nanowires fabricated by dual-bath electrodeposition in nanoporous polycarbonate membranes
Rio Kawana, Natsuko Oguchi, Daiki Oshima, Michiyuki Yoshida, Takashi Sugiura, Mikiko Saito, Takayuki Homma, Takeshi Kato, Teruo Ono, Mutsuhiro Shima, K. Yamada
Abstract
Abstract We have successfully controlled the layer thickness in Co-Pt alloy multilayer nanowires with a diameter of approximately 130 nm through dual-bath electrodeposition into nanoporous polycarbonate templates. The Co-Pt alloy multilayer nanowires were found to have compositions of cobalt-rich (Co 71 Pt 29 ) and platinum-rich (Co 13 Pt 87 ) for various layer thicknesses ranging from 3.3 to 427 nm, as confirmed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations. Both X-ray diffraction (XRD) and TEM analyses revealed a face-centered cubic (FCC) alloy phase corresponding to the Co-Pt alloy in each layer. We could measure the increasing magnetoresistance (MR) ratio by reducing the layer thickness and demonstrate MR measurements resulting from domain wall motion.