Fabrication of fully epitaxial ZnO/Fe₃O₄ heterostructures on conductive LaNiO₃

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• 作者：P. Li ; M.Y. Sun ; H.L. Bai ; ^{baihaili@tju.edu.cn}
• 关键词：Epitaxial ZnO/Fe3O4 heterostructure ; Surface roughness ; Verwey transition
• 刊名：Thin Solid Films
• 出版年：2012
• 期刊代码：78_00406090
• 类别：ph
• 出版时间：1 July, 2012
• 卷：520
• 期：18
• 页码：5971-5976
• 文件大小：1197 K

摘要

Fully epitaxial ZnO(0001)/Fe₃O₄(111) spin injection heterostructures with LaNiO₃(111) conductive buffer layers were fabricated on SrTiO₃(111) by sputtering for the prospective spin injection experiments. Epitaxial growth of Fe₃O₄ can be realized at temperatures higher than 673 K on LaNiO₃(111) substrates. The epitaxial relationship was determined to be . With the increase of LaNiO₃ growth temperature, the surface of Fe₃O₄ in the hybrid heterostructures becomes flatter whereas the magnetization of ZnO/Fe₃O₄ decreases. A Verwey transition located at ~ 110 K was observed in all the ZnO/Fe₃O₄ heterostructures, demonstrating the stoichiometry and good crystallinity of Fe₃O₄.