Quantitative Probes for Dynamics in Multiferroic Complex Oxides

非技术描述：在设计和制造薄膜的能力方面的最新进展导致了对结合了理想的磁性和电学性能的材料的新的控制程度。这些多铁性材料同时具有长程磁序和电序，并允许这两种现象相互作用。多铁性的前景在于，将磁性和电性有序结合起来，可能会产生新的电子和光子器件。这项由这笔赠款资助的工作是基于对多铁性中的磁性的新的实验探测器，这将允许同时探测的磁性、结构和铁电性。这些探头是基于X射线显微镜和使用同步辐射的衍射，这使得埋藏在电极下的多铁薄膜可以被研究。解决多铁性薄膜中磁性的起源和结构，以及磁场与电场的相互作用，将使多铁性得到更充分的发展和利用。最终，这项研究的结果可能导致基于优化薄膜中的电和磁现象的相互作用的传感器、致动器和磁性设备。研究生和本科生将部分在国家设施中使用先进的X射线表征技术，并努力进一步开发这些技术。技术细节：多铁氧化物中磁序和铁电极化之间的关系有望成为一种利用外加电场来操纵磁性的方法。这笔赠款支持开发硬X射线显微镜探头，用于研究多铁氧化物薄膜在外加电场下的磁性和铁电性。利用Fe-K吸收边的共振磁散射来确定多铁性氧化铋铁氧体薄膜中的磁序及其在电场中的演化过程。X射线衍射的结构特性将同时允许解决由于压电性和极化开关引起的结构变化。了解多铁材料的磁性和铁电性将有助于开发氧化铋的潜力和设计改进材料。参与该项目的学生将参与国家同步加速器光设施中与科学家的科学合作。这项工作还将涉及本科生研究人员的高度参与。这项研究的所有参与者都将开展外展活动，包括制作关于共振散射背后的概念的演示。

NON-TECHNICAL DESCRIPTION:Recent developments in the capability to design and fabricate thin films have led to a new degree of control over materials combining desirable magnetic and electronic properties. These multiferroic materials have both long-range magnetic and electrical order and allow the two phenomena to interact. The promise of multiferroics lies in the possibility that combining both magnetism and electrical order can result in new electronic and photonic devices. The work funded by this grant is based on new experimental probes for magnetism in multiferroics that will allow magnetism, structure, and ferroelectricity of to be probed simultaneously. These probes are based on x-ray microscopy and diffraction using synchrotron radiation, which allows multiferroic thin films buried beneath electrodes to be studied. Addressing the origin and structure of the magnetism in multiferroic thin films and the interaction of magnetism with electric fields will allow multiferroic to be more fully developed and exploited. Ultimately, the results of this research could lead to sensors, actuators, and magnetic devices based on optimizing the interaction of electrical and magnetic phenomena in thin films. Graduate and undergraduate students will work in part at national facilities with advanced x-ray characterization techniques and work to develop these techniques further.TECHNICAL DETAILS:The relationship between magnetic order and ferroelectric polarization in multiferroic oxides holds promise as a way to manipulate magnetism with applied electric fields. This grant supports the development of hard x-ray microscopy probes for the magnetism and ferroelectricity of multiferroic oxide thin films under applied electric fields. Resonant magnetic scattering at the Fe K absorption edge will be used to determine what magnetic order exists in multiferroic bismuth iron oxide thin films and how the magnetism evolves in electric fields. The structural specificity of x-ray diffraction will simultaneously allow changes in structure due to piezoelectricity and polarization switching to be addressed. Understanding the magnetism and ferroelectricity of multiferroics will aid in exploiting the potential of bismuth iron oxide and in designing improved materials. The students involved in this project will participate in scientific collaborations with scientists at national synchrotron light facilities. The work will also involve a high degree of participation by undergraduate researchers. All of the participants in this research will conduct outreach activities including developing of demonstrations of the concepts behind resonant scattering.