由于糖精有利于减小铁磁薄膜的内应力,而这种内应力在镍铁合金的许多应用中是不利的,故在镍铁镀液中,糖精是常用的添加剂.在镀液其他成份不变的基础上,研究了仅当糖精浓度2.5~20 g/L变化时,内置电镀长条形铁芯磁通门噪声的变化情况.对以上长条形铁芯构成的磁通门,进行了噪声功率谱密度测试,结果表明:当糖精浓度从2.5 g/L增加到20 g/L时,1 Hz噪声功率谱密度从9.387槡nT/ Hz非线性地减小到了1.386槡nT/ Hz;同时也表明为了使磁通门的噪声最小时,最常用的糖精浓度(5 g/L)并不是最好的浓度,而应是更大的糖精浓度.%Saccharin is a common additive used in nickel iron alloy plating baths for electroplating of NiFe alloy. The reason is that saccharin is beneficial to decrease the internal stress of ferromagnetic thin film,which is unfavorable in many applications of electroplated NiFe alloy.Change of magnetic noise with the long strip iron core based on the unchanged other composition of plating bath is studied while the only concentration of saccharin is changed from 2.5 g/L to 20 g/L.The noise power spectrum density has been measured for the fluxgate sensor based on the long strip iron core made under different saccharin concentration. The results show that a noise spectral density decreased nonlinearly from 9. 387 nT/√Hz at 1 Hz for 2. 5 g/L saccharin concentration to 1.386nT/√Hz when saccharin is increased to 20 g/L. This also show that the most common saccharin concentration of 5 g/L in fact is not the best concetration when it comes to minimize the noise of the fluxgate,but larger concentration is required.
展开▼
