PREPARATION OFCo–W–PMAGNETIC THIN FILMS BY ELECTROLESS DEPOSITION

Yundan Yu, Guoying Wei (), Hongliang Ge, Ying Gao, Zhen Zhao and Lan Jiang
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Yundan Yu: College of Materials Science and Engineering, China Jiliang University, Hang Zhou 310018, China
Guoying Wei: College of Materials Science and Engineering, China Jiliang University, Hang Zhou 310018, China
Hongliang Ge: College of Materials Science and Engineering, China Jiliang University, Hang Zhou 310018, China
Ying Gao: College of Materials Science and Engineering, China Jiliang University, Hang Zhou 310018, China
Zhen Zhao: College of Materials Science and Engineering, China Jiliang University, Hang Zhou 310018, China
Lan Jiang: College of Materials Science and Engineering, China Jiliang University, Hang Zhou 310018, China

Surface Review and Letters (SRL), 2009, vol. 16, issue 04, 635-642

Abstract: An alkaline bath was developed for electroless deposition ofCo–W–Pthin films on a copper substrate. Effects of pH values, various concentrations of reducing agent, and different powers of ultrasonic on composition, microstructure, and magnetic properties of the films were investigated. It was found out that higher pH could improve cobalt atomic percentage and reduce amounts of phosphorus and tungsten in the film while larger amounts ofNaH2PO2would decrease the cobalt content but increase the tungsten and phosphors content. The ultrasonic was introduced during the electroless deposition. Few effects of ultrasonic on the cobalt content were observed. X-ray diffraction showed that almost all of the deposited films were crystalline and contained hexagonal cobalt with a preferred crystallographic orientation (002). However, a typical amorphousCo–W–Pfilm, which has smooth surface, and no crystallite with definite grains could be obtained when the concentration ofNaH2PO2in the bath was over 1.2 mol/L. The films with rougher and agglomerate nodular structures would be formed in the bath with a higher pH value. Certain power (60 W, 40 kHz) of ultrasonic could smash the grains and led to the formation of a denser and smoother surface. Cracks appeared at the surface of the film when the ultrasonic power was 150 W. Vibration sample magnetometer results showed that the film with maximum magnetization (600 emu/g) and coercivity (1000 Oe) could be achieved when introducing ultrasonic (60 W, 40 kHz) during the deposition.

Keywords: Co–W–Pthin films; electroless deposition; ultrasonic; microstructure; magnetic properties (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X09012950

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