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自支撑多铁性薄膜材料研究的机遇与挑战

Opportunities and challenges in freestanding multiferroic membranes

  • 摘要: 多铁性材料兼具铁电、铁磁等两种或两种以上铁性有序,并且通过不同铁性之间的多物理场耦合实现新奇磁电效应,在信息存储、换能、传感等方面具有广阔的应用前景。当前,在基础及应用研究方面仍存在许多亟待解决的科学技术问题,譬如寻找及制备室温以上具有强磁电耦合效应的多铁性材料,以及解决与半导体的器件集成问题等,而近年来迅速发展的自支撑薄膜制备技术为此提供了新的机遇。与块体材料及束缚在刚性衬底上的外延薄膜相比,自支撑薄膜具有极为优异的晶格调控自由度,可获得前所未有的极端一维、二维应变(应变梯度),并能够实现人工异质结的构建与器件集成等,为多铁性材料的研究提供了新的材料体系和契机。文章围绕自支撑钙钛矿氧化物(多)铁性材料及人工异质结,总结了最近的重要研究进展,并尝试初步探讨该方向未来可能面临的机遇与挑战。

     

    Abstract: Multiferroic materials have two or more ferroelectric orders, such as ferroelectricity and ferromagnetism, at the same time. The coupling and interaction between these ferroelectric orders can give rise to intriguing magnetoelectric effects, which can be used in information storage, energy conversion, sensing, etc. At present, there are still many important scientific questions in basic science and electronic applications, such as realizing ferroelectric/ferromagnetic multiferroic materials with strong magnetoelectric coupling above room temperature, device integration with semiconductors, etc. The rapid development of freestanding oxide membranes in recent years provides new opportunities for studies on multiferroics. Compared with bulk materials and epitaxial thin films clamped on rigid substrates, freestanding membranes have an excellent degree of freedom in lattice tuning. They can experience unprecedented extreme one-dimensional and two-dimensional strains and strain gradients, and can also be utilized to construct artificial heterostructures and devices, providing new material systems and opportunities to advance the development of multiferroic materials. In this article, we focus on the recent progress of research on multiferroic materials based on freestanding membranes, and attempt to forecast the opportunities and challenges that may be faced in this direction in the future.

     

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