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Preparation of magnetic films by new technique "ultrasound enhanced" ferrite plating

“超声增强”铁氧体电镀新技术制备磁性薄膜

基本信息

批准号：
08455137
负责人：
ABE Masanori
金额：
$ 4.99万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455137/
关键词：
ferrite plating magnetite Zi-Zn ferrite ultrasound waves ferrite films フェライトカプセル球

项目摘要

Ferrite plating invented by the investigators enables formation of ferrite films from aqueous solution. Requiring no heat treatment, the ferrite plating facilitates fabrication of ferrite film devices using non-heat-resistant substances (e.g.plastics, nano-sized multilayrs, etc.) as substrates. In this study we combined the ferrite plating with sonochemical technology to improve the crystallinity and magnetic properties of the plated films. Applying power ultrasound waves (19.5kHz, 600W) to an FeCl_2 aqueous solution at 70ﾟC,we successfully encapsulated polyacrylate spheres of two sizes, 0.25 mum and 4.5mum in average diameter, with ferrite coatings of a magnetite-maghemite mixed solution. This broke the previous lower limit (0.3mum) of the size of the particles to be encapsulated ; without application of the ultrasound waves, the ferrite coating became discontinuous or insular. Applying high frequency ultrasound waves (1.6MHz, 20W) and the above low frequency ultrasound waves simultaneously, Fe_3O_4 films were successfully improved in surface smoothness and solubility limit of Ni ions in films of NiZn ferrite (Ni_<3-x-y> Ni_x Zn_y O_4) was increased from x=0.35 to 0.42. The marked improvements are ascribed to "hot spots" and "micro-stirring" caused by collapse of cavitation bubbles in the sonicated aqueous solution.

研究人员发明的铁氧体电镀能够从水溶液中形成铁氧体膜。无需热处理，铁氧体镀层便于使用非耐热物质（例如塑料、纳米尺寸的多层等）制造铁氧体薄膜器件。作为底物。本研究将铁氧体镀膜与声化学技术相结合，以提高镀膜的结晶度和磁性能。在70 ℃的FeCl_2水溶液中施加功率超声波（19.5KHz，600 W），成功地将平均粒径为0.25 μ m和4.5 μ m的聚丙烯酸酯微球包覆在磁铁矿-磁赤铁矿混合溶液的铁氧体涂层上。这打破了先前要封装的颗粒尺寸的下限（0.3 μ m）;在不施加超声波的情况下，铁氧体涂层变得不连续或孤立。同时应用高频超声波（1.6MHz，20 W）和低频超声波，成功地改善了Fe_3O_4薄膜的表面平整度，使Ni离子在NiZn铁氧体（Ni_<3-x-y>Ni_xZn_yO_4）薄膜中的溶解极限由x=0.35提高到0.42。显着的改善归因于“热点”和“微搅拌”所造成的空化气泡在超声处理的水溶液中的崩溃。