Magnetoimpedance Effects in Electrodeposited NiFe Nanowire Array

Abstract

In this work, NiFe nanowires were grown in highly ordered porous anodic alumina oxide templates by dc electrodeposition at a pH value of 2.6. Scanning electron microscopy showed that wires have diameters of about 250 310 nm and length 2530 µm. The energy dispersive X-ray analysis showed that the composition of the nanowires is Ni65Fe35. Electrical contacts were made on both sides of the nanowire array and their magnetoimpedance properties were investigated. All the magnetoimpedance curves showed single peak behavior due to the high shape anisotropy. The maximum magnetoimpedance change at the 79 MHz driving current frequency was ≈ 1.45%.

Effects of Current Pulsation on Magnetic Properties and Giant Magnetoimpedance of Electrodeposited NiFe Coatings on Cu Wires

“…Among various magnetic thin film materials, NiFe alloys of a range of chemical compositions, from Ni-rich permalloy to Fe-rich invar, are of great interest. They are being utilized in recording devices, memory devices for computer, microelectromechanical systems (MEMS), and magnetic sensor applications [1,[3][4][5][6], where low coercivity (H C ), high saturation magnetization (M S ), high permeability (µ r ), and a high magnetoimpedance (MI) ratio with good MI sensitivity are often required [7]. In general, NiFe alloys exhibit soft magnetic properties [8], decent MI response [9,10], and excellent corrosion resistance [11].…”

“…In general, NiFe alloys exhibit soft magnetic properties [8], decent MI response [9,10], and excellent corrosion resistance [11]. The alloys can be fabricated by several techniques including molecular beam epitaxy (MBE) [2], sputtering [6] and electrodeposition [5,8]. The latter technique, electrodeposition, has been proved simple and versatile in forming and compositional tailoring the films in relatively short periods.…”

“…For NiFe electrodeposition baths, Ni Watt-type based electrolytes are often employed, as they provide low levels of residual stresses in NiFe deposits as compared to sulphate and chloride electrolytes [6,12]. Normally, additives, such as citric acid, sodium lauryl sulphate, and saccharine are also introduced to the bath to improve the plating conditions [3,5,13,14].…”