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多鐵/順磁復(fù)合薄膜的界面輸運(yùn)特性與耦合機(jī)制研究
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西北工業(yè)大學(xué)應(yīng)用物理系凝聚態(tài)材料結(jié)構(gòu)與性質(zhì)實(shí)驗(yàn)室,西北工業(yè)大學(xué)應(yīng)用物理系凝聚態(tài)材料結(jié)構(gòu)與性質(zhì)實(shí)驗(yàn)室,西北工業(yè)大學(xué)應(yīng)用物理系凝聚態(tài)材料結(jié)構(gòu)與性質(zhì)實(shí)驗(yàn)室,西北工業(yè)大學(xué)應(yīng)用物理系凝聚態(tài)材料結(jié)構(gòu)與性質(zhì)實(shí)驗(yàn)室,西北工業(yè)大學(xué)應(yīng)用物理系凝聚態(tài)材料結(jié)構(gòu)與性質(zhì)實(shí)驗(yàn)室

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國家自然科學(xué)基金 (基金號(hào)：61078057, 61471301, 51172183, 51402240和51471134)；陜西省自然科學(xué)基金 (基金號(hào)：2012JQ8013，2015JQ5125)，西北工業(yè)大學(xué)專項(xiàng)研究基金（基金號(hào)： JC20120246，3102015ZY078）以及高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金（基金號(hào)：20126102110045）資助的課題.


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

    本文通過BiFeO3/La2/3Sr1/3MnO3（BFO /LSMO），研究了多鐵/順磁復(fù)合結(jié)構(gòu)的界面輸運(yùn)以及磁電耦合機(jī)制。利用激光分子束外延技術(shù)制備了單相、質(zhì)量良好的薄膜結(jié)構(gòu)，采用電學(xué)、磁學(xué)、光學(xué)等多種測試手段對(duì)其輸運(yùn)特性、鐵磁性、磁介電特性等進(jìn)行了測試與表征.結(jié)果表明界面的漏電導(dǎo)機(jī)制是空間電荷限制電流機(jī)制；復(fù)合薄膜在室溫下表現(xiàn)出的鐵磁性主要來源于BFO層，界面處誘導(dǎo)出的網(wǎng)狀磁矩會(huì)使樣品產(chǎn)生比較明顯的磁電耦合.在零場冷卻（ZFC）和場冷卻（FC）下，樣品的磁介電系數(shù)分別在160K和170K達(dá)到極大值，介電損耗-溫度曲線在150-170附近產(chǎn)生分裂，該溫度區(qū)間與BFO層的相變相關(guān).

    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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牛利偉,邢輝,陳長樂,董祥雷,金克新.多鐵/順磁復(fù)合薄膜的界面輸運(yùn)特性與耦合機(jī)制研究[J].稀有金屬材料與工程,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
  • 錄用日期:2016-12-02
  • 在線發(fā)布日期: 2017-09-27
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