多铁性异质结研究进展

Progress and prospect in multiferroic heterostructures

  • 摘要: 多铁异质结中的磁电耦合效应是凝聚态物理和材料物理的研究热点之一。相比单相的多铁材料,多铁异质结中界面处的自旋、电荷、轨道以及晶格之间存在着复杂的相互作用,从而导致一些新的物理现象,使得其在新一代的存储器、传感器、微波等领域中有重要的应用前景。本文主要介绍近年来在多铁异质结方向取得的进展,着重介绍人们通过应变效应、场效应、交换偏置效应等途径实现电场对磁性的控制,以及磁电对铁电性的调控,从而获得很大的磁电耦合效应;分析了多铁隧道结及其磁电耦合效应,其集成了传统铁电隧道结和铁磁隧道结的优势,可大幅度提高单个存储单元存储状态,从而提高存储密度。最后提出当前面临的问题和对未来的展望。

     

    Abstract: The magnetoelectric (ME) coupling effect in multiferroic heterostructures is one of the hottest topics of condensed matter physics and materials science. In comparison with single-phase multiferroic materials, multiferroic heterostructures with complex interactions among spin, charge, orbit, and lattice at the interface display some novel physical phenomena, and show potential applications in a new generation of memory, sensors, and microwave and so on. In this paper, the recent progresses and prospects in multiferroic heterostructures are summarized with emphasis on the strain- or charge-mediated as well as exchange bias effects on the magnetic and transport properties manipulated by electric/magnetic fields. The magnetoelectric coupling effects of multiferroic tunnel junctions which combine the merits both magnetic and ferroelectric tunnel junctions are particularly introduced. The multiferroic tunnel junctions exhibit multi-stable resistance states in a single memory unit cell, and thus increase the memory density. Finally, the current issues and future researches for promising spin, charge as well as strain related data storage in multiferroic heterostructures are discussed.

     

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