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多铁/顺磁复合薄膜的界面输运特性与耦合机制研究
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作者单位:

西北工业大学应用物理系凝聚态材料结构与性质实验室,西北工业大学应用物理系凝聚态材料结构与性质实验室,西北工业大学应用物理系凝聚态材料结构与性质实验室,西北工业大学应用物理系凝聚态材料结构与性质实验室,西北工业大学应用物理系凝聚态材料结构与性质实验室

基金项目:

国家自然科学基金 (基金号：61078057, 61471301, 51172183, 51402240和51471134)；陕西省自然科学基金 (基金号：2012JQ8013，2015JQ5125)，西北工业大学专项研究基金（基金号： JC20120246，3102015ZY078）以及高等学校博士学科点专项科研基金（基金号：20126102110045）资助的课题.


Interfacial transport and coupling properties of the multiferroic/paramagnetic-composition thin film
Author:
Affiliation:

Shaanxi Key Laboratory for Condensed Matter Structure and Properties, Department of Applied Physics, Northwestern Polytechnical University,,Shaanxi Key Laboratory for Condensed Matter Structure and Properties, Department of Applied Physics, Northwestern Polytechnical University,,Shaanxi Key Laboratory for Condensed Matter Structure and Properties, Department of Applied Physics, Northwestern Polytechnical University,,Shaanxi Key Laboratory for Condensed Matter Structure and Properties, Department of Applied Physics, Northwestern Polytechnical University,,Shaanxi Key Laboratory for Condensed Matter Structure and Properties, Department of Applied Physics, Northwestern Polytechnical University,

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    摘要:

    本文通过BiFeO3/La2/3Sr1/3MnO3（BFO /LSMO），研究了多铁/顺磁复合结构的界面输运以及磁电耦合机制。利用激光分子束外延技术制备了单相、质量良好的薄膜结构，采用电学、磁学、光学等多种测试手段对其输运特性、铁磁性、磁介电特性等进行了测试与表征.结果表明界面的漏电导机制是空间电荷限制电流机制；复合薄膜在室温下表现出的铁磁性主要来源于BFO层，界面处诱导出的网状磁矩会使样品产生比较明显的磁电耦合.在零场冷却（ZFC）和场冷却（FC）下，样品的磁介电系数分别在160K和170K达到极大值，介电损耗-温度曲线在150-170附近产生分裂，该温度区间与BFO层的相变相关.

    Abstract:

    In order to explore the transport and coupling properties of multiferroic interfaces, a multiferroic/paramagnetic-composition thin film was investigated by successively growing La2/3Sr1/3MnO3 (LSMO) and BiFeO3 (BFO) multilayer-structure. Laser molecular beam epitaxy (LMBE) method was employed to prepare an idea structure of the composition thin film. Analysis of the leakage current demonstrates that the space-charge-limited current dominates the leakage current mechanism. Magnetic measurements show that the ferromagnetism of the composition thin film originates from BFO layer and the net magnetic moments could be responsible for the enhanced magnetoelectric coupling. The interface exhibits robust magnetodielectric effects at temperature points of 160K and 170K for zero field cooling (ZFC) and field cooling (FC), respectively. Furthermore, there exists a split in the loss tangent-temperature curves over temperature range of 150-170K between different cooling conditions, which is related to phase transition in the BFO layer.

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牛利伟,邢辉,陈长乐,董祥雷,金克新.多铁/顺磁复合薄膜的界面输运特性与耦合机制研究[J].稀有金属材料与工程,2017,46(5):1315~1320.[NIU LIWEI, CHEN CHANGLE, CHEN CHANGLE, DONG XIANGLEI, JIN KEXIN. Interfacial transport and coupling properties of the multiferroic/paramagnetic-composition thin film[J]. Rare Metal Materials and Engineering,2017,46(5):1315~1320.]
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  • 收稿日期:2016-07-06
  • 最后修改日期:2016-11-30
  • 录用日期:2016-12-02
  • 在线发布日期: 2017-09-27

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