Exploring the Nuclear Magnetic Resonance (NMR) technique as tool for modern materials research

探索核磁共振 (NMR) 技术作为现代材料研究的工具

• 批准号: 397409592
• 负责人: Dr. Sabine Wurmehl
• 金额: --
• 依托单位: Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IFW) e.V.
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/397409592?language=en
• 关键词: Exploring; Nuclear; Magnetic; Resonance; NMR

One of the major challenges in modern materials research is the understanding and control of structure-property-relationships in order to tailor specific properties of functional (magnetic) materials. This fact requires a thorough analysis of structure and in response of the (magnetic) properties, and is, in particular, to be addressed if the structure of a given material is modified with the aim to control the properties, e.g. by annealing, ion irradiation, substitution of constituents or by downscaling to yield nanoscale objects.This project aims to explore the power of NMR as sophisticated method to study structural, magnetic and electronic structure modifications of selected functional magnetic materials on a local scale and to further advance the NMR method. During this project we will explore NMR as tool to monitor changes in the material; we will use four selected parameters to modify structure and properties to challenge the NMR technique: (i) we will apply ion beam irradiation to alter chemical order and in response the magnetic properties of different functional intermetallic materials showing high spin polarization (Co2MnSi), a strong interaction between structure and magnetic properties (Fe60Al40) and magnetocaloric properties (Fe-Rh). The impact of ion irradiation is local and difficult to be studied by e.g. XRD, we will explore to which extend NMR will be able to resolve the structural modifications upon irradiation (aim 1), (ii) we will study the impact of annealing on the structural properties of MnN film stacks. Here, we combine three advances of NMR, namely, we will study the (local) structure of both MnN and the adjacent Co-Fe layer, we will investigate the local magnetic properties by rf power dependencies and we will shed light on the interface between MnN and Co-Fe (aim 2), (iii) we will investigate the evolution of properties and in particular the half-metallic ground state in a substitution series on the of Co2MnAlxSi1-x, revealing whether there is a statistical distribution of host and substitution atoms, we will learn whether additional disorder plays a role and we will measure the changes in the electronic structure upon substitution (aim 3). (iv) We will downscale magnetic intermetallic materials to the nanoscale and explore the power and limits of NMR to study their properties in response to their downsizing (aim 4).Nuclear magnetic resonance (NMR) is a versatile and sensitive lab-based method to encounter the problem of investigating detailed structural, electronic and magnetic property changes as outlined above. We expected to challenge the NMR technique to study functional magnetic materials relevant for modern materials research.

现代材料研究的主要挑战之一是理解和控制结构-性能-关系，以定制功能（磁性）材料的特定性能。这一事实要求对结构进行彻底的分析，并对核磁共振是一种重要的物理（磁性）性质，特别是如果给定材料的结构被修改以控制其性质，例如通过退火，离子辐照，成分取代或通过缩小规模以产生纳米级物体，则需要解决。该项目旨在探索NMR作为研究结构，在局部范围内对选定的功能磁性材料进行磁性和电子结构修饰，并进一步推进NMR方法。在这个项目中，我们将探索NMR作为监测材料变化的工具;我们将使用四个选定的参数来修改结构和性能，以挑战NMR技术：（i）我们将应用离子束辐照来改变化学顺序，并相应地改变显示高自旋极化的不同功能金属间化合物材料（Co2 MnSi）的磁性，结构与磁性能（Fe_（60）Al_（40））和磁热性能（Fe-Rh）之间的强相互作用。离子辐照的影响是局部的，并且难以通过例如XRD来研究，我们将探索在何种程度上NMR将能够解决辐照后的结构修改（目标1），（ii）我们将研究退火对MnN膜堆叠的结构性质的影响。在这里，我们将联合收割机的NMR的三个进展，即，我们将研究MnN和相邻的Co-Fe层的（局部）结构，我们将通过RF功率依赖性研究局部磁性，我们将阐明MnN和Co-Fe之间的界面（目的2），（iii）我们将研究Co_2MnAl_xSi_（1-x）的性质的演变，特别是在一系列替代中的半金属基态，揭示主体原子和取代原子是否存在统计分布，我们将了解是否有额外的无序发挥作用，我们将测量取代后电子结构的变化（目标3）。(iv)我们将把磁性金属间化合物材料缩小到纳米级，并探索核磁共振的能力和局限性，以研究它们的性能，以应对它们的缩小（目标4）。核磁共振（NMR）是一种多功能和灵敏的实验室方法，可以解决如上所述的研究详细结构，电子和磁性变化的问题。我们期望通过核磁共振技术来研究与现代材料研究相关的功能磁性材料。

项目成果

Magnetic and magnetocaloric properties of the Co2-xMn B system by experiment and density functional theory

• DOI: 10.1016/j.actamat.2018.11.034
• 发表时间: 2019-02
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: S. Ener;M. Fries;F. Hammerath;I. Opahle;E. Simon;P. Fritsch;S. Wurmehl;Hongbin Zhang;O. Gutflei

Extraction of Dzyaloshinskii-Moriya interaction from propagating spin waves

• DOI: 10.1103/physrevb.101.064432
• 发表时间: 2020-02-28
• 期刊: PHYSICAL REVIEW B
• 影响因子: 3.7
• 作者: Lucassen, Juriaan;Schippers, Casper F.;Lavrijsen, Reinoud
• 通讯作者: Lavrijsen, Reinoud

Structure-property relationship of Co2MnSi thin films in response to He+-irradiation

• DOI: 10.1038/s41598-019-39435-4
• 发表时间: 2019-02-26
• 期刊: SCIENTIFIC REPORTS
• 影响因子: 4.6
• 作者: Hammerath, Franziska;Bali, Rantej;Wurmehl, Sabine
• 通讯作者: Wurmehl, Sabine