标题： (111)和(001)-NiO薄膜的体材料类似结构、磁性和光学特性 显示英文标题

标题： Bulk-like structural, magnetic and optical properties of (111)- and (001)-NiO thin films

摘要： 我们分别使用脉冲激光沉积（PLD）在（0001）-蓝宝石和（001）-MgO基底上生长了（111）和（001）取向的NiO薄膜。直流磁化率测量表明，样品的奈尔温度高于室温。这进一步通过这些薄膜在环境条件下存在双磁子拉曼散射模式得到证实。此外，在至少30纳米厚度的薄膜中，双磁子模式相对于相邻声子模式的相对强度与块体NiO中的相同。紫外-可见光谱和光谱椭偏仪测定表明，薄膜的带隙为3.6 eV，这在块体NiO的范围内。因此，这些结果表明薄膜具有块体特性。此外，对（111）-NiO薄膜的光致发光测量得到了385和405 nm处的两个辐射跃迁。后者线宽随低温而变宽，表明可能存在激子-磁子耦合。总体而言，由于这些PLD生长的氧化物薄膜具有光学透明性，并且能够在室温下容纳强磁子，因此它们具有重要的技术重要性。 显示英文摘要

摘要： We have grown (111)- and (001)-oriented NiO thin films on (0001)-Sapphire and (001)-MgO substrates using pulsed laser deposition (PLD), respectively. DC magnetic susceptibility measurements underline that the N\'eel temperatures of the samples are beyond room-temperature. This is further confirmed by the presence of two-magnon Raman scattering modes in these films in ambient conditions. Moreover, relative intensity of the two magnon-mode with respect to a neighboring phonon mode in the films, at least down to 30 nm thickness, is comparable to the same for bulk NiO. UV-vis spectroscopy and spectroscopic ellipsometry determined that the bandgap of the films is 3.6 eV which is well within the range for bulk NiO. Thus, these indicate that the thin films are bulk-like. Further, photoluminescence measurements on (111)-NiO films obtained two-radiative transitions at 385 and 405 nm. The linewidth of the latter broadens towards low temperatures, indicating a plausible exciton-magnon coupling. Overall, these PLD-grown oxide films hold significant technological importance due to their optical transparency and their capacity to host robust magnons at room temperature.