MRI: Acquisition of Vibrating Sample Magnetometer for Materials Research and Education

这项主要研究仪器拨款为购置用于磁性材料表征的振动样品磁强计（VSM）提供资金。用VSM确定磁滞曲线，即磁场与磁矩的关系。磁滞曲线提供了材料在外加磁场下的磁响应，通常被称为磁指纹。VSM允许测量平行和垂直于外加磁场的磁矩。这一独特的仪器特征对于理解磁性是至关重要的，因为磁矩和磁场是矢量，除了有大小也有方向。该仪器用于研究薄膜和粉末材料，目前正在德克萨斯州立大学进行研究。VSM的获得增强了至少8个不同学术团体在5个不同项目中的研究。受新VSM影响的研究项目包括：(1)用于风力涡轮机和发电机的新型永磁材料，(2)用于电化学储能的二维（2D）材料，(3)具有优越机械性能的纳米复合材料，以及(4)用于传感器、执行器和新型非易失性存储设备的新型金属氧化物薄膜。VSM仪器将加强德克萨斯州立大学的教育和研究，德克萨斯州立大学是一所少数民族服务机构，拥有大量第一代学生和来自代表性不足群体的学生。VSM进一步促进了与区域初创公司Urban Mining的有意义合作的发展，德克萨斯州立大学提议获得一台高场矢量振动样品磁力仪（VSM），用于磁性材料的表征，包括粉末，薄膜和大块磁性材料。该矢量VSM允许在很宽的温度、场强和场方向范围内研究磁化和磁各向异性。快速的温度和磁场控制以及工具的简单性和鲁棒性使新的VSM作为主要的磁性表征工具使用，并有效地在德克萨斯州立大学本科和研究生课程中实施。VSM的获得增强了至少8个不同学术团体在5个不同项目中的研究。拟议的研究包括研究以下材料的磁性：RRAM过渡金属氧化物中的缺陷团簇，低维系统，特别是正在研究用于电池的氢氧化物和氧氢氧化物，包括NdFeB永磁体在内的硬磁材料，新型自旋电子器件和氧空位的作用，MBE生长的铁磁薄膜，用于新型传感器和应用的射频溅射BFO薄膜，以及用于超材料的印刷磁性薄膜。

This Major Research Instrumentation grant provides funding for the acquisition of a vibrating sample magnetometer (VSM) used for the characterization of magnetic materials. A VSM is used to determine the magnetic hysteresis curve, i.e. the relation between the magnetic field and the magnetic moment. The hysteresis curve provides the magnetic response of the material under an applied field and is often referred to as the magnetic fingerprint. The VSM allows the measurements of the magnetic moment both parallel and perpendicular to the applied magnetic field. This unique instrumental feature is crucial to the understanding of magnetic properties as magnetic moment and field are vector quantities that have in addition to a magnitude also a direction. The instrument is used to study thin film and powder materials that are currently being investigated at Texas State University. The VSM acquisition enhances the research in at least 8 different academic groups across 5 different programs. Research projects impacted by the new VSM include studies of (1) new permanent magnetic materials to be applied in wind turbines and generators, (2) two-dimensional (2D) materials for electrochemical energy storage, (3) nanocomposite materials with superior mechanical properties, and (4) novel metal oxide thin films for applications in sensors, actuators, and new non-volatile memory devices. The VSM instrument will enhance education and research within Texas State which is a Minority-serving Institution with a significant population of 1st generation students and students from underrepresented groups. The VSM further enable development of a meaningful collaboration with a regional start-up company, Urban Mining Texas State University proposes to acquire a high field vector vibrating sample magnetometer (VSM) for the characterization of magnetic materials including powders, thin films and bulk magnetic materials. This vector VSM allows the study of the magnetization and magnetic anisotropy over a wide temperature, field magnitude, and field direction range. The fast temperature and field control and the simplicity and robustness of tool enables the use of the new VSM as a work-horse magnetic characterization tool and effectively implement it in Texas State University undergraduate and graduate curriculum. The VSM acquisition enhances the research in at least 8 different academic groups across 5 different programs. Proposed research includes studies of the magnetic properties of: defect clusters in RRAM transition metal oxides, low dimensional systems, specifically hydroxides and oxyhydroxides that are being studied for applications in batteries, hard magnetic materials including NdFeB permanent magnets, novel spintronic devices and the role of oxygen vacancies, thin ferromagnetic films grown by MBE, RF sputtered BFO films for application in novel sensors and applications, and printed magnetic thin films for use in meta-materials.