Magnetic nanowires are of immense importance in ultrahigh density magnetic storage media, micromagnetic sensors in read heads and spintronics devices. The nanowires of binary alloys of ferromagnetic metals like Co, Ni and Fe are particularly important since they possess high coercivities and high squareness ratio, which is an important requirement for magnetic storage applications.Template directed electrodeposition is a cost-efficient and simpler way to synthesize nanowires because of its ability to tailor size, composition, and microstructure with desired magnetic properties.The deposition temperature controls the growth and kinetics of depositing atoms in the porous membranes so as to get the desired phase and structure. Also the pH of the bath can control the formation of different phases of Co-Fe alloy.In the present study, arrays of Ni-Fe and Co-Fe nanowires of different compositions are synthesized by electrodeposition in anodic aluminium oxide (AAO) and track-etched polycarbonate (PCT) templates of diameters ranging from 20nm to 100nm. The structural characteristics of the samples are examined using X-ray diffraction (XRD) and transmission electron microscope (TEM).The dependence of structural and magnetic properties of alloy nanowires on electrodeposition process parameters like pH and temperature of the electrolytic bath has been investigated.
Journal: TechConnect Briefs
Volume: 2, Nanotechnology 2010: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational
Published: June 21, 2010
Pages: 118 - 121
Industry sector: Advanced Materials & Manufacturing
Topics: Advanced Materials for Engineering Applications