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用X射线衍射、X射线光电子能谱、透射电子显微镜和差示扫描量热法对溅射法制备的Ag超微粒子的晶体学结构、表面组成、微粒形态和热力学性质进行了分析。结果表明,所制备的微粒为内部为Ag、表面为Ag2O的两相微粒,以及单一的Ag2O微粒,粒径在10nm以上的微粒没有确定的外形,粒径在10nm以下的微粒为球形。微粒有不同于块体金属Ag的异常热效应。到40天时,沉积在碳膜上的Ag,Ag2O两相微粒有一部份还原形成了单一的金属Ag超微粒子。
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Using the ion-beam-sputtering technique,we have fabricated Fe/Al2O3/Fe magnetic tunnelling junctions (MTJs).We have observed double-peaked shapes of curves,which have a level summit and a symmetrical feature,showing the magnetoresistance of the junction as a function of applied field.We have measured the tunnel conductance of MTJs which have insulating layers of different thicknesses.We have studied the dependence of the magnetoresistance of MTJs on tunnel conductance.The microstructures of hard-and soft-magnetic layers and interfaces of ferromagnets and insulators were probed.Analysing the influence of MJT microstructures,including those having clusters or/and granules in magnetic and non-magnetic films,a magnetization reversal mechanism(MRM) is proposed,which suggests that the MRM of tunnelling junctions may be explained by using a group-by-group reversal model of magnetic moments of the mesoscopical particles.We discuss the influence of MTJ microstructures,including those with clusters or/and granules in the ferromagnetic and non-magnetic films,on the MRM. 相似文献