Room-temperature magnetoelectric coupling in nanocrystalline nanocrystalline Pr₂Ti₂O₇

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• 作者：Li Sun ; Lin Ju ; Hongwei Qin ; Minglei Zhao ; Wenbin Su ; Jifan Hu
• 关键词：Magnetic ; Ferroelectric ; Sol&ndash ; gel method ; Magnetodielectric
• 刊名：Physica B
• 出版年：2013
• 出版时间：15 December, 2013
• 年：2013
• 卷：431
• 期：Complete
• 页码：49-53
• 全文大小：1069 K

文摘

Rare-earth titanate monoclinic nanocrystalline Pr₂Ti₂O₇ was prepared by the sol-gel method. The nanocrystalline Pr₂Ti₂O₇ pellets present room temperature ferromagnetism. Vacuum annealing enhances ferromagnetism which disappears for the pellet with subsequent long time air-annealing, indicating that the observed ferromagnetism is connected with the oxygen vacancies. The Pr₂Ti₂O₇ pellets annealed at 1000 ¡ãC for 1 h show the coexistence of ferromagnetism and ferroelectricity at room temperature. The room-temperature magnetodielectric effect was observed in Pr₂Ti₂O₇ pellets. In addition, the electric field treatment leads to an enormous enhancement of saturation magnetization for Pr₂Ti₂O₇ multiferroic pellet, showing a strong magnetoelectric coupling.