tailieunhanh - Influence of magnetic field on properties of electrodeposited FeCo layer

Effect of magnetic field on the electrodeposition of FeCo layers has been investigated with respect to the orientation of the magnetic field to surface electrode magnetic field is parallel and perpendicular to electrode. Electrochemical behaviours, morphology, composition, structure and magnetic properties were investigated using cyclic voltammogram (CV), Scanning Electron Microscopy (SEM), Energy Dispersion Spectroscopy (EDS), X-Ray Diffractometer (XRD), Vibrating Sample Magnetometer (VSM). Results show that morphology and structure of the deposited layers are not effected by external magnetic field. | Journal of Chemistry, Vol. 47 (5), P. 591 - 595, 2009 INFLUENCE OF MAGNETIC FIELD ON PROPERTIES OF ELECTRODEPOSITED FeCo LAYER Received 21 November 2008 1 MAI THANH TUNG , DANG VIET ANH DUNG1, NGUYEN XUAN TRUONG2 1 Dep. of Electrochemistry and Corrosion Protection, Hanoi University of Technology 2 Dep. of Analytical Chemistry, Hanoi University of Technology ABSTRACT Effect of magnetic field on the electrodeposition of FeCo layers has been investigated with respect to the orientation of the magnetic field to surface electrode magnetic field is parallel and perpendicular to electrode. Electrochemical behaviours, morphology, composition, structure and magnetic properties were investigated using cyclic voltammogram (CV), Scanning Electron Microscopy (SEM), Energy Dispersion Spectroscopy (EDS), X-Ray Diffractometer (XRD), Vibrating Sample Magnetometer (VSM). Results show that morphology and structure of the deposited layers are not effected by external magnetic field. Meanwhile, the Fe content of the layer decreases by following sequence CFe(B=0)>CFe(B//)>CFe(⊥), resulting in the following sequence of coerciviy HC(B=0)> HC (B//)> HC (⊥). These results were explained based on the → magnetohydronamic (MHD) effect caused by the Lorentz force ( FL ) when magnetic field is superimposed. I - INTRODUCTION Soft magnetic films are essentially applied for thin-film recording heads to meet the future trends in high-density magnetic recording. For this purpose, it is necessary to develop recording heads using material with optimized magnetic and corrosion properties. Three groups of magnetic films can be distinguished: nickel – iron, cobalt – iron, and ternary alloys composed of cobalt – iron and a third element like nickel, copper, or chromium [1-5]. The electrochemical deposition of these films seems to be technologically interesting since the electrodeposition is a fast, cost effective technique and suitable for covering of large areas and applicable to mass .