Micorstructural and magnetic characterisation of a new kind of magnetic hybrid materials

经典的磁性混合材料包含软磁或硬磁颗粒。因此，它们显示出主动磁流变效应或在硬磁颗粒磁化后表现出被动磁流变性质。在这个德国和俄罗斯项目组的研究协会中，我们将联合收割机磁性硬颗粒和软颗粒结合在弹性体基质中，以提供主动和被动磁流变性能的组合。 在这种情况下，它是研究协会的中心目标，合成量身定制的磁性混合材料的传感器应用的基础上详细的微观理解的材料特性。在这里描述的子项目中，微观结构调查以及磁性粒子间相互作用的实验分析是工作计划的重点。微观结构调查使用X射线显微断层扫描测量，允许三维评估的颗粒分布与单颗粒分辨率。在申请的项目阶段，我们将特别关注杂化材料中小颗粒重组的评估，因为这些在材料的理论描述中起着重要作用。此外，在磁化过程中以及在机械负荷下的结构变化将通过显微断层扫描进行检查。相应的数据作为研究协会内理论工作组进行模拟的基准。磁性粒子间的相互作用，使用一阶阻力曲线（FORCs）的调查将扩展到澄清与基体的相互作用，从而对结构重组和混合材料的磁性行为的颗粒形状的影响。对数据的详细解释需要对曲线有更深入的理论理解，这将由理论工作组提供。总的来说，我们希望该项目将提供有关磁混合材料的微观结构变化和宏观性能之间关系的详细信息。 该信息将为预测某些材料特性提供基础，这可以通过材料组成的相应变化来实现。

Classical magnetic hybrid materials contain either magnetically soft or magnetically hard particles. Thus, they show either an active magnetorheological effect or exhibit passive magnetorheological properties after magnetization of the magnetically hard particles. Within this research association of German and Russian project groups we combine magnetically hard and soft particles in an elastomeric matrix to provide a combination of active and passive magnetorheological properties. In this context, it is the central goal of the research association to synthesize tailored magnetic hybrid materials for sensor applications based on a detailed microscopic understanding of the material properties. Within the subproject described here, microstructural investigations as well as the experimental analysis of the magnetic interparticle interactions are in focus of the working program. The microstructural investigations use X-ray microtomography measurements allowing a three-dimensional evaluation of the particle distribution with single particle resolution. In the project phase applied for we will especially focus on the evaluation of reorganization of small particles in the hybrid material since these play an important role in the theoretical description of the material. Moreover structural changes as well during magnetization processes as under mechanical load will be examined by microtomography. The respective data serves as well as an input as as a benchmark for the simulations undertaken by the theoretically working groups within the research association. The investigations of magnetic interparticle interaction between the different particles using First Order Reversal Curves (FORCs) will be extended to clarify the influence of the particle shape on the interaction with the matrix and thus on structural reorganization and magnetic behaviour of the hybrid materials. The detailed interpretation of the data requires a deeper theoretical understanding of the curves, which will be provided by the theoretically working groups. In total, we expect that the project will provide detailed information about the relation between microstructural changes and macroscopic properties of the magnetic hybrid materials. This information will provide the basis for a prediction of certain material properties, which can be achieved by respective changes in composition of the material.