Nanoscale investigation of coupling phenomena in bismuth ferrite under continuously varied mechanical stress

连续变化机械应力下铁氧体铋耦合现象的纳米级研究

• 批准号: 217693827
• 负责人: Professor Dr. Lukas M. Eng
• 金额: --
• 依托单位: Institut für Angewandte Physik (IAP)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/217693827?language=en
• 关键词: Nanoscale; investigation; coupling; phenomena; bismuth

Being one of the very few multiferroic single-phase compounds at room temperature, bismuth ferrite (BFO) is currently a highly topical field of solid-state research. Apart from its potential for lead-free piezoelectric, magnetoelectric, photovoltaic or multilevel memory applications, the fundamental understanding of the subtle response of the strongly coupled ferroic properties of BFO to external fields defines an important goal in the physics of multiferroics. The in-depth study of how the electronic, ferroelectric, and magnetic configuration of BFO can be tuned, especially in thin films, by inducing mechanical stress via continuously variable external uniaxial sample bending stands in the focus of the current project. During in-situ substrate bending, macroscopic key properties – such as electronic structure, conductivity, electric and magnetic polarization and their mutual coupling – as well as the corresponding nanoscopic fingerprints will be analyzed. One main issue is the investigation of the nanoscale stress-induced behavior of the different ferroic domain types and their boundaries by the simultaneous application of electrically and magnetically sensitive scanning probe methods. Moreover, the aim is to optimize the ferroic parameters via the tunable external stress systematically.

铁酸铋（BFO）是极少数室温下多铁性单相化合物之一，目前是固态研究的热门领域。除了其在无铅压电、磁电、光伏或多级存储器应用中的潜力外，对 BFO 强耦合铁性特性对外部场的微妙响应的基本理解定义了多铁性物理学的一个重要目标。当前项目的重点是深入研究如何通过连续可变的外部单轴样品弯曲诱导机械应力来调整 BFO 的电子、铁电和磁性配置，特别是在薄膜中。在原位基板弯曲过程中，将分析宏观关键特性（例如电子结构、电导率、电场和磁极化及其相互耦合）以及相应的纳米指纹。一个主要问题是通过同时应用电敏感扫描探针方法来研究不同铁磁畴类型及其边界的纳米级应力诱导行为。此外，目的是通过可调节的外部应力系统地优化铁参数。

项目成果

Nanoscale and macroscopic electrical ac transport along conductive domain walls in lithium niobate single crystals

• DOI: 10.1088/2053-1591/1/3/035012
• 发表时间: 2014-09-01
• 期刊: MATERIALS RESEARCH EXPRESS
• 影响因子: 2.3
• 作者: Schroeder, Mathias;Chen, Xi;Eng, Lukas M.
• 通讯作者: Eng, Lukas M.

Strain-mediated elastic coupling in magnetoelectric nickel/barium-titanate heterostructures

• DOI: 10.1103/physrevb.87.054410
• 发表时间: 2013-02
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: R. Streubel;D. Köhler;R. Schäfer;L. Eng

Shedding light on nanoscale ferroelectrics

• DOI: 10.1016/j.cap.2014.06.003
• 发表时间: 2014-08
• 期刊: Current Applied Physics
• 影响因子: 2.4
• 作者: J. Seidel;L. Eng