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.

这个项目致力于合成具有磁电耦合的复合材料，并对这些系统的关键铁电/铁磁或铁电/铁磁界面进行多尺度表征。微复合材料是通过有机溶胶法生成的粉末合成的。这就产生了3-0和3-3两种形态的陶瓷。放电等离子烧结可制备纳米复合材料。在项目扩展阶段，通过脉冲激光沉积(PLD)合成具有2-2和1-3纳米级形貌的复合材料来修正这些结构。多尺度表征是通过组合互补技术来实现的。宏观上，利用第一阶段研制的设备确定本构行为，提供外加电场和磁场作用下的应力-应变曲线等综合力学本构特性。使用我们改进的SQUID磁强计揭示了关键的磁电耦合参数，允许在样品上施加电场。复合材料对电刺激的磁响应可以以最高的精度记录下来。介观信息是通过扫描探针技术获得的，即原子力显微镜、压电力显微镜和磁力显微镜(AFM、PFM和MFM)。在同步辐射设施中利用线性和圆形X射线二色性(XLD和XMCD)进行的X射线吸收测量提供了微观信息。这使得能够分析多铁相互作用，直到原子长度尺度，产生关于所有相关长度尺度的唯一信息。此外，材料的半导体性质将进入开尔文探针显微镜对材料性质的描述，这在文献中是第一次讨论。这些联合实验结果为本研究单位内铁性的理论建模提供了必要的输入参数和基准。