High anisotropic inserted dendritic growth during first stage of Zn monolayer deposition on Ag(111) substrate

分形石墨烯中的量子霍尔效应：石墨烯粒子的生长与性质

Quantum Hall Effect in Fractal Graphene: Growth and Properties of Graphlocons

直径高达0.25 mm的高度树枝状石墨烯晶体通过低压化学气相沉积在铜外壳内合成。由于它们的六重对称性和分形形状，这些晶体类似于雪花。研究了不同生长条件下枝晶生长特征的演变，发现表面扩散是枝晶形成的生长限制步骤。枝状晶体的电子性质进行检查，以低于开尔文温度，显示高达6300厘米$^2$ V $^{-1}$ S $^{-1}$和量子霍尔振荡的迁移率观察到高于4 T。这些结果表明，尽管其粗糙的树枝状边缘的高品质的传输性能。

高沉积速率下二维外延岛的形态稳定性

On the morphological stability of two-dimensional epitaxial islands at high deposition rates

研究了真空或气相原子沉积过程中在衬底上成核的二维岛的形态稳定性。使用简单的缩放参数，它表明，与预期相反，树枝状岛屿可以转换成紧凑的增加沉积速率，只要临界核的大小是足够大的。讨论了最近观察到的Pt在Pt（111）上沉积的意义。

基于格里菲斯理论的陶瓷固态电解质碱金属枝晶生长分析模型

Theory of Dendritic Crack Growth in Ceramic Solid-State Batteries

研究基于格里菲斯理论，推导出临界电流密度与最大预存界面缺陷长度的关系，并提出残余电子导电导致枝晶尖端电化学应力腐蚀开裂的理论，扩展了临界电流密度的应用范围。

由分离确定的二维岛形状

Two-Dimensional Island Shape Determined by Detachment

本文用正方形格子气模型的动力学蒙特卡罗模拟研究了各向异性剥离对异质外延岛形状的影响。只有在分子沉积之后再进行表面扩散，岛才以分枝的树枝状形状生长，类似于DLA。从边缘引入分子分离使岛紧凑。为了理解在氢封端的Si（111）邻位表面上并五苯生长的实验中观察到的各向异性岛形状，假设衬底台阶周围的分离不对称。边缘分子在较高阶地上的分离比在较低阶地上的分离多。岛的边缘是光滑的，分子容易脱离，而难以脱离的边缘是树枝状的。如果岛彼此靠近，则岛倾向于排成一条线，因为从右岛的光滑边缘分离的分子被馈送到左岛的树枝状和快速生长的边缘。

Effect of Tantalum spacer thickness and deposition conditions on the properties of MgO/CoFeB/Ta/CoFeB/MgO free layers

To get stable perpendicularly magnetized tunnel junctions at small device dimensions, composite free layers that comprise two MgO/FeCoB interfaces as sources of interface anisotropy are generally used. Proper cristallisation and annealing robustness is typically ensured by the insertion of a spacer layer of the early transition metal series within the FeCoB layer. We study the influence of the spacer thickness and growth condition on the switching metrics of tunnel junctions thermally annealed at 400$^\circ$C for the case of 1-4 Å Ta spacers. Thick Ta spacer results in a large anisotropies ind…

Simulation and analysis of $γ$-Ni cellular growth during laser powder deposition of Ni-based superalloys

Cellular or dendritic microstructures that result as a function of additive manufacturing solidification conditions in a Ni-based melt pool are simulated in the present work using three-dimensional phase-field simulations. A macroscopic thermal model is used to obtain the temperature gradient $G$ and the solidification velocity $V$ which are provided as inputs to the phase-field model. We extract the cell spacings, cell core compositions, and cell tip as well as mushy zone temperatures from the simulated microstructures as a function of $V$. Cell spacings are compared with different scaling la…