Controlled growth of CoCu nanowires and application to multilayered CoCu/Cu nanowires with selected anisotropy

Abstract

The effects of the solution pH and deposition potential on the structural and magnetic properties in arrays of electrodeposited CoCu nanowires with low Cu content have been studied combining ferromagnetic resonance, magnetometry and electron transmission microscopy. It is shown that, depending on the synthesis parameters, the average crystallographic structure can be controlled, giving rise to sensible changes in the effective crystal anisotropy field which varies from −4.05 to +2.75 kOe. It is also shown that in CoCu/Cu multilayered nanowires, the preferential structure of the CoCu-magnetic layer can also be controlled by both pH and deposition potential, opening an interesting route for designing multilayered CoCu/Cu nanowires with controlled and alternated crystal anisotropy.

Structure and magnetic properties of CoxCu1−x nanowires in self-assembled arrays

“…Liu et al [12] have observed that increase in dc electrodeposition voltage increases of Cu content to about 50% in an electrolyte with 3.3 electrolyte acidity. It has also been reported that as dc electrodeposition potential becomes more positive, the Cu content increases due to the high reduction standard potential of Cu +2 [9]. The present results show fabrication possibility of Cu-rich or Co-rich nanowires by controlling of off-time between the pulses which enables us to fabricate the Co/Cu multilayer nanowires with the magnetic resistance properties.…”

“…Self-assembled nanopores in anodic alumina have been used to grow cylindrical magnetic nanowires with various diameters and high aspect ratios [7,8]. The addition of nonmagnetic impurities is a suitable way to control the magnetic properties of the magnetic nanowire arrays [9,10]. Among the magnetic metals, Co is the best choice due to its high spin diffusion length and large magnetocrystalline anisotropy.…”

Tailoring magnetic properties in arrays of pulse-electrodeposited Co nanowires: The role of Cu additive

“…This increment in Cu (at. %) takes place due to an electroless process during the electrodeposition of Co NWs as the deposition potential for Co and Cu is different [36]. On the basis of a previous study on the effect of T off on crystalline structure of Co NWs, we found that, increasing the duration of off-time between pulses can considerably affect the crystalline orientation of Co NWs fabricated using pulsed dc electrodeposition [29].…”

Effects of anodization and electrodeposition conditions on the growth of copper and cobalt nanostructures in aluminum oxide films

“…The effects of composition and pH of the plating electrolyte on the magnetic properties of Co/AAO and CoNi/AAO assemblies are currently under investigation in our laboratory. The ease of fabrication of Co nanowire arrays reported in this work combined with the possibility of controlling the effective magnetic anisotropy opens the way to various applications and, in particular, cobalt-based multilayered giant magnetoresistive sensing [29].…”