Ferromagnetism and Crossover of Positive Magnetoresistance to Negative Magnetoresistance in Na-Doped ZnO

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• 作者：Yiren Wang ; Xi Luo ; Li-Ting Tseng ; Zhimin Ao ; Tong Li ; Guozhong Xing ; Nina Bao ; Kiyonori Suzukiis ; Jun Ding ; Sean Li ; Jiabao Yi
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：February 24, 2015
• 年：2015
• 卷：27
• 期：4
• 页码：1285-1291
• 全文大小：412K
• ISSN：1520-5002

文摘

Na doped ZnO films were fabricated via a hydrothermal process. The films have shown room temperature ferromagnetism and p-type conductivity. Crossover of positive to negative magnetoresistance has been observed with the variation of Na doping concentrations. The positive MR is due to p-p exchange interaction induced Zeeman splitting to suppress the hopping path of holes. The ferromagnetism is attributed to the formation of a Zn vacancy complex. The negative magnetoresistance is due to the minimization of spin-dependent scattering by the applied magnetic field.