Grain-to-grain Curie temperature (Tc) variation in the media reduces signal-to-noise ratio due to its contribution in transition jitter noise, especially when average grain size is pushing down to increase the area storage capacity. A thermally insulating magnetic grain boundary may suppress such grain-to-grain Tc variation, especially at small grain size. Here we present an experimental study on the effect of adding thermally-insulating magnetic oxide, in particular BaFexOy, as part of the grain boundary materials in granular FePt-C HAMR media. It is found that the BaFexOy is chemically inert to FePt and the chemical ordering of FePt-BaFexOy-C media are similar to that of FePt-C meida. By tuning the volume fraction of BaFexOy and C, well-separated FePt grains (average grain size = 6.8 nm) surrounded by BaFexOy shell with perpendicular Hc above 35 kOe can be obtained. Transmission electron microscopy study with chemical analysis shows that the magnetic oxide appears to be crystalline and surround the FePt grains with immediate full enclosure. Magnetic measurements indicate an effective increase of magnetic grain size at temperatures below FePt Curie temperature. Pulsed laser pump-probe measurement indicates a measurable reduction of Curie temperature variation for the FePt-BaFexOy-C media with carefully comparison with the reference FePt-C media.
Impact of charge transition levels on grain boundary properties in acceptor doped oxide ceramics: A phase-field study
Technische Universität Darmstadt（达姆施塔特工业大学）；IMDEA Materials（IMDEA材料研究所）；Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院）；RWTH Aachen University（亚琛工业大学）；Max Planck Institute for Solid State Research（马克斯·普朗克固体的研究研究所）；University of Stuttgart（斯图加特大学）
Unraveling impacts of polycrystalline microstructures on ionic conductivity of ceramic electrolytes by computational homogenization and machine learning
Laser-induced crystallization of copper oxide thin films: A comparison made between Gaussian and chevron-beam profiles provides a clue for the failure of Gaussian-beam profile
在结晶非单晶薄膜的尝试中，经常采用具有高斯光束轮廓的激光的使用;然而，其仅导致多晶薄膜的形成。本文介绍了非单晶氧化铜（CuO）的选区晶化。通过激光诱导结晶，激光诱导结晶，具有人字形的光束轮廓。通过从由小的100 nm X 100 nm CuO晶粒组成的非单晶相到氧化铜（I）（Cu 2 O）的单晶相的转变的展示来验证结晶。通过电子背散射衍射和拉曼光谱确定了该转变，这清楚地表明形成了尺寸为5 μm x 1 mm的Cu 2 O单晶畴。在此基础上，建立了基于元胞自动机模型的局部再结晶和随机形核的理论模型。理论评估可以定性地描述重要的可观察特征（例如，晶粒的尺寸和总几何形状）。理论评估预测，所得结晶度（单晶或多晶）的差异主要取决于非单晶区域沿激光扫描方向发生熔化的几何轮廓;凹形拖尾轮廓产生导致单晶的较大晶粒而凸形拖尾轮廓产生导致多晶的较小晶粒，为什么人字形光束轮廓能成功地产生单晶，而高斯光束轮廓却不能？
Understanding early stages of low-temperature hydrogen-driven direct co-reduction of Fe-Ni mixed oxide thin films at the near atomic scale
Chair for Materials Discovery and Interfaces, Institute for Materials, Ruhr-Universität Bochum（鲁尔大学材料研究所材料发现与界面讲席）；Max Planck Institute for Sustainable Materials（马克斯·普朗克可持续材料研究所）；Center for Interface Dominated High Performance Materials (ZGH), Ruhr-Universität Bochum（鲁尔大学界面主导高性能材料中心）
Time-temperature superposition in grain and grain boundary response regime of A2HoRuO6 (A = Ba, Sr, Ca) double perovskite ceramics: A Conductivity Spectroscopic Analysis
在多晶双钙钛矿氧化物A_2HoRuO_6（AHR; A = Ba，Sr，Ca）的交流电导率域中，研究了晶粒和晶界响应的时温叠加原理，寻求一个合适的普适标度因子.随着离子半径的减小，样品显示出从立方到单斜的不同结构相。材料中的变形程度通过键价和（BVS）与键合强度相关。所有样品的电导率谱均服从幂律行为。不同的微观结构特征的导电过程的贡献。直流电阻率的热变化指向从最近邻到可变范围跳变的逐渐交叉。从直流电导率，跳跃频率和弛豫频率得到的激活能显示导电和弛豫机制之间的密切相关性。AHR的比例电导率曲线表明，存在两个不同的导电过程与不同的激活能在晶界和晶粒响应制度。由此得出结论，当材料中同时存在两个不同的热激活区时，单一的标度参数不足以普遍满足时温叠加原理。
Generalized estimates for thermal expansion of oxide scale in the range from 0C to 1300C with account for movability of phase transitions in its components
Dielectric Deposition Enhanced Crystallization in Atomic-Layer-Deposited Indium Oxide Transistors Achieving High Gated-Hall Mobility Exceeding 100 cm2/Vs at Room Temperature
National Key Laboratory of Advanced Micro and Nano Manufacture Technology and School of Information Science and Electronic Engineering, Shanghai Jiao Tong University（上海交通大学信息科学与电子工程学院）；Beijing Superstring Academy of Memory Technology（北京超弦存储器研究院）
Microstructural Effects of Chemical Island Templating in Patterned Matrix-Pillar Oxide Nanocomposites
在外延基质-柱纳米复合材料中图案化柱的位置的能力是使用这些有趣的材料开发未来技术的关键挑战。一种这样的模型系统采用嵌入铁电BiFeO $_{3}$（BFO）矩阵中的亚铁磁性CoFe $_{2}$ O $_{4}$（CFO）柱，其已经被提出作为可能的存储器或逻辑系统。这些复合材料通过物理气相沉积生长时，在随机位置通过成核自发地自组装形成柱。最近的结果表明，如果在衬底上预先图案化柱材料的岛，则可以控制成核过程并确定柱形成的位置。在这项工作中，我们采用电子显微镜和X射线衍射检查图案化的CFO-BFO纳米复合材料的化学组成和微观结构。横截面透射电子显微镜被用来检查在模板岛和所产生的支柱之间的界面处的成核效应。在模板支柱中的晶界和晶格倾斜的证据也被提出，并归因于种子岛的微观结构。
Grain boundary and defects assisted thermal conductivity of nano-crystalline Gd2Ti2O7 Pyrochlore
研究烧绿石结构陶瓷的热导率对烧绿石结构陶瓷作为惰性基质燃料、氧化物燃料电池电解质和热障涂层的应用具有重要意义。采用放电等离子烧结结合高能球磨的方法制备了纳米晶Gd 2 Ti 2 O 7，研究了孔隙率、结构缺陷和晶界散射对材料热性能的影响。热导率已被测量的温度范围从室温到900 ℃，使用激光闪光装置（LFA），并讨论了结果，包括几个现象，有助于在nc-烧绿石的热传输的散射机制的支持。随着晶粒尺寸的减小，热导率的系统性降低可以通过声子-孔隙散射现象来理解。此外，还观察到随着温度的升高，边界散射对热传输的主导作用。实验确定的热导率值与热障涂层（TBC）应用的隔热要求相一致
Tuning sizes, morphologies, and magnetic properties of mono- vs. multi-core iron oxide nanoparticles through control of added water in the polyol synthesis
Effect of grain boundary state and grain size on the microstructure and mechanical properties of alumina obtained by SPS: A case of the amorphous layer on particle surface
Predicting the Realizable Maximum Power Factor using the Jonker and Ioffe formulation: Al-doped ZnO Triangular Microcrystals with Graphite Inclusion Case Study
Probing the Effects of Heat Treatment Atmosphere on the Structural and Electrical Properties of NBT via Eu Photoluminescence
State Key Laboratory of Integrated Optoelectronics, Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Education, School of Physics, Northeast Normal University（东北师范大学物理学院集成光电子学国家重点实验室教育部紫外发光材料与技术重点实验室）
