Voltage dependent physical, dielectric and magnetic properties of electrodeposited Co1−xMnx alloy nanowires

Abstract

The Co1−xMnx (9.1≤x≤15.2) alloy nanowires with uniform size and high density have been prepared by AC electrodeposition method into the anodized aluminum oxide AAO templates by using the different AC potential from 9 V to 13 V. A systematic study has been done about the voltage dependent physical, dielectric and magnetic properties of CoMn nanowires. The diameter and length of nanowires is found to be 95 nm and 15 μm respectively by getting the image from Secondary Electron Microscope. The Energy Dispersive X-ray Spectroscopy gave the information which shows that the composition of Mn and Co increases and decreases respectively with the increase of deposition voltage. It was observed from X-ray Diffraction data of all samples that CoMn alloy nanowires have the cubic structure and crystallite size vary from∼39.6 nm to∼48.9 nm. The Fourier Transform Infrared Spectroscopy pattern shows the presence of other materials such as CoO, MnO, and Al2O3 at different wavenumber range. The dielectric constant, dielectric loss, tangent loss and AC conductivity have been measured from LCR meter data at room temperature. The aforementioned dielectric properties decrease with the increase of deposition voltage due to incorporation of Mn ions and deduction of Co ions. The descending trend of AC conductivity against the increasing voltage is also due to the increase of grain boundary volume. The M-H loops of CoMn nanowires have been measured by using the Vibrating Sample Magnetometer and show the anisotropic and ferromagnetic behavior. From hysteresis loops, it is also found that magnetization reversal has nucleation mode and squareness decreases with increase of angle. The effective anisotropy is found to be along the nanowires. This study is useful to modify the physical, structural, dielectric and magnetic properties of the metallic materials according to desire devices.