Experimental characterization of magneto-electric composites

磁电复合材料的实验表征

• 批准号: 201206536
• 负责人: Professor Dr. Doru Constantin Lupascu
• 金额: --
• 依托单位: Forschungsgruppe Experimentalphysik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/201206536?language=en
• 关键词: Experimental; characterization; magneto; electric; composites

This project is devoted to the synthesis of composites with magnetoelectric coupling and the multi-scale characterization of the crucial ferroelectric/ferromagnetic or ferroelectric/ ferrimagnetic interfaces of these systems. Micro composites are synthesized via powders generated from the organosol route. This yields ceramics with 3-0 and 3-3 morphologies. Spark-plasma-sintering produces nano composites. For the project extension phase these structures are amended by composites with 2-2 and nano scale 1-3 morphologies synthesized by means of pulsed laser deposition (PLD). Multi-scale characterization is achieved by combination of complementary techniques. Macroscopically the constitutive behavior is determined utilizing the equipment developed in the first project phase providing the comprehensive mechanical constitutive properties like stress-strain curves with applied electric and magnetic fields. The crucial magnetoelectric coupling parameters are revealed using our modified SQUID magnetometer allowing for the application of an electric field to the sample. The magnetic response of the composites to an electric stimulus can be recorded with highest precision. Mesoscopic information is gained by scanning probe techniques, namely atomic, piezoelectric, and magnetic force microscopy (AFM, PFM and MFM). X-ray absorption measurements utilizing linear and circular X-ray dichroism (XLD and XMCD) at synchrotron radiation facilities provide the microscopic information. This allows for the analysis of the multiferroic interactions down to the atomic length scale yielding unique information on all relevant length scales. Furthermore, semiconductor properties of the materials will enter the description of material properties as seen by Kelvin-probe microscopy, the first time discussed in literatur. These joint experimental results yield the essential input parameters and benchmarks for the theoretical modeling of the ferroic properties within this research unit.

该项目致力于磁电耦合复合材料的合成以及这些系统关键铁电/铁磁或铁电/亚铁磁界面的多尺度表征。微复合材料是通过有机溶胶途径产生的粉末合成的。这会产生具有 3-0 和 3-3 形貌的陶瓷。火花等离子烧结可生产纳米复合材料。在项目扩展阶段，这些结构通过脉冲激光沉积 (PLD) 合成的 2-2 和纳米级 1-3 形态的复合材料进行了修改。多尺度表征是通过互补技术的组合来实现的。从宏观上讲，本构行为是利用项目第一阶段开发的设备确定的，提供综合机械本构特性，如施加电场和磁场的应力-应变曲线。使用我们改进的 SQUID 磁力计可以对样品施加电场，从而揭示关键的磁电耦合参数。可以以最高精度记录复合材料对电刺激的磁响应。介观信息是通过扫描探针技术获得的，即原子显微镜、压电显微镜和磁力显微镜（AFM、PFM 和 MFM）。在同步加速器辐射设施中利用线性和圆形 X 射线二色性（XLD 和 XMCD）进行 X 射线吸收测量可提供微观信息。这使得可以对原子长度尺度的多铁相互作用进行分析，从而产生所有相关长度尺度的独特信息。此外，材料的半导体特性将进入开尔文探针显微镜所见的材料特性描述，这是文献中首次讨论。这些联合实验结果为本研究单位内的铁性能理论建模提供了基本的输入参数和基准。