采用激光分子束外延法制备了多铁/顺磁结构的BiFeO3/La2/3Sr1/3MnO3 (BFO /LSMO)异质结,通过外场调控的方法研究了该异质结界面的电子输运以及磁电耦合特征.结果表明,异质结的输运机制来源于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,且磁矩来源于BFO层,异质结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160和170 K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层的铁弹-极化相变相关.
A multiferroic/paramagnetic heterostructure has been fabricated by successively growing La2/3Sr1/3MnO3 (LSMO) and BiFeO3 (BFO) layers on LaA1O3-(100) via a laser molecular beam epitaxy (LMBE) method.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 composite film originates from BFO layer and the net magnetic moments could be responsible for the enhanced magnetoelectric coupling.The heterostructure exhibits robust magnetodielectric effects at temperature points of 160 K and 170 K for zero field cooling (ZFC) and field cooling (FC),respectively.Furthermore,there is a split in the loss tangent-temperature curves near temperature range of 150～170 K between different cooling conditions,which is related to phase transition in the BFO layer.
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