Effect of Bath pH on the Squareness of Electroless CoNiWP Magnetic Films  

作　　者：Haibin CHENG Shuai XU Wenyu ZHAO Suling ZHAO Pengcheng ZHAI Zhigang SUNand Qingjie ZHANGt Pengcheng ZHAI Zhigang SUN Qingjie ZHANG 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

出　　处：《Journal of Materials Science & Technology》2008年第5期712-714,共3页材料科学技术（英文版）

基　　金：the National Natural Science foundation of China under grant No.50572083.

摘　　要：Electroless CoNiWP magnetic films were prepared by varying the bath pH and then characterized by energy dispersive X-ray analysis, X-ray diffraction and magnetic force microscopy, it has been found that the microstructure and the magnetic properties of films were influenced greatly by the bath pH. At the bath pH 8.06, the grain size and coercivity of the films reach maximuml while the squareness （Mr/Ms） of MH curves reaches minimum. The Henkel plots indicates that the exchange-coupling interaction is very weak at this pH, which may be caused by phase-separation and large grain size, and then results in the lowest squareness. At pH above 8.5, obvious exchange-coupling interaction is observed because of the inexistence of phase-separation and the refinement of grain size.Electroless CoNiWP magnetic films were prepared by varying the bath pH and then characterized by energy dispersive X-ray analysis, X-ray diffraction and magnetic force microscopy, it has been found that the microstructure and the magnetic properties of films were influenced greatly by the bath pH. At the bath pH 8.06, the grain size and coercivity of the films reach maximuml while the squareness （Mr/Ms） of MH curves reaches minimum. The Henkel plots indicates that the exchange-coupling interaction is very weak at this pH, which may be caused by phase-separation and large grain size, and then results in the lowest squareness. At pH above 8.5, obvious exchange-coupling interaction is observed because of the inexistence of phase-separation and the refinement of grain size.

关 键 词：CoNiWP magnetic film Bath pH SQUARENESS Exchange-coupling interaction 

分 类 号：O484[理学—固体物理]