tailieunhanh - Influence of additives on the structure and magnetic properties of electrodeposited magnetic film FeCoNi alloy

In this paper, we present results of study on the influence of additives saccharin, thioure and natrilaurylsulphate on the structure and the magnetic properties of the electrodeposited FeCoNi alloy film. | Journal of Chemistry Vol. 44 4 P. 510 - 513 2006 INFLUENCE OF ADDITIVES ON THE STRUCTURE AND MAGNETIC PROPERTIES OF ELECTRODEPOSITED MAGNETIC FILM FeCoNi ALLOY Received 26 July 2005 MAI THANH TUNG1 BUI THI KHANH NHUNG2 Faculty of Chemical Technology Hanoi University of Technology International Training Institution for Materials Science Hanoi University of Technology summARy Influence of additives saccharin thioure and natrilaurylsulphate on structure and magnetic properties of electrodeposited FeCoNi alloy films was investigated using scanning electron microscope SEM X-ray Diffraction XRD and hysteresis loop measurement. SEM results showed that all films electrodeposited in solutions containing additives have fine crystall structures. The bcc fcc intensity ratio and mean grain size size calculated from XRD analyses indicate that the grain size decreases and the bcc texture of the films increases following the sequence non-additive natrilaurylsulphate saccharin and thioure. The changes of both factors mean grain size and bcc texture result a decrease of magnetic coercivity Hc following the above sequence. I - INTRODUCTION Magnetic thin films of ternary alloy FeCoNi have been widely applied for fabrication of magnetic sensors and write-read head of computers 1 - 3 . Although the FeCoNi film can change from soft to hard magnetic material depending on the composition this type of alloy has been mainly used for substitution of soft magnetic permaloy Ni80Fe20 owing to its higher magnetic flux density Bs and higher specific resistance p 1 - 3 . Among the methods for fabrication of the magnetic thin films electrodeposition technique is one of the most widely used processes due to its cost efficient and possibility to produce the 3D magnetic microstructures. In order to improve the magnetic mechanical and corrosion protection properties of the electrodeposited FeCoNi thin film several additives can be added into the deposition electrolyte. Among them saccharin 510 thioure .