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Abstract
We fabricated composition gradient sodium potassium niobate [(K,Na)NbO_3, KNN] thin films on (111)Pt/Ti/SiO_2/Si by multi-target RF magnetron sputtering to optimize KNN film composition by combinatorial method. We successfully obtained c-axis oriented KNN thin films with perovskite structure on 6-inch Si wafers. The KNN film composition was measured by energy dispersive x-ray spectroscopy (EDX) and we confirmed composition gradient of K/(K+Na) ratio of the KNN thin film on Si wafer along with the line between KNbO_3 and NaNbO_3 targets. This result indicates that the combinatorial sputtering is useful for precise optimization of the deposition condition and film composition of the lead-free KNN thin films.
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