标题： 锰氧化物超晶格薄膜的纳米尺度摩擦由层厚度和氟含量控制 显示英文标题

标题： Nanoscale friction of manganite superlattice films controlled by layer thickness and fluorine content

摘要： 我们使用侧向力显微镜研究[LaMnO3]m/[SrMnO3]n超晶格薄膜中的纳米尺度摩擦，重点关注氟掺杂和顶层厚度的影响。 对于所有样品，摩擦力与施加的法向力和粘附力之和成线性比例。 虽然由于局部粘附波动，摩擦力在空间上有所变化，但每个样品的摩擦系数保持位置不变。 然而，摩擦系数系统地受到氟浓度和顶层厚度的影响。 我们的数据表明，摩擦能量耗散可延伸至表面以下5 nm，显示出对亚表面结构的明显依赖。 我们认为这是由于应力场内的粘弹性耗散以及滑动探针产生的倏逝波，这些可以定量解释观察到的摩擦系数。 这些结果表明，一旦正确考虑粘附，摩擦系数是一个可重复的材料属性，可以通过对表面和亚表面层的控制修改来调节。 显示英文摘要

摘要： We investigate nanoscale friction in [LaMnO3]m/[SrMnO3]n superlattice films using lateral force microscopy, focusing on the effects of fluorine doping and top-layer thickness. For all samples, friction forces scale linearly with the sum of the applied normal and adhesion forces. While friction forces vary spatially due to local adhesion fluctuations, the friction coefficient remains position independent for each specimen. It is, however, systematically influenced by fluorine concentration and top-layer thickness. Our data indicates that frictional energy dissipation extends up to 5 nm beneath the surface, demonstrating a clear dependence on subsurface structure. We attribute this to viscoelastic dissipation within the stress field and evanescent waves generated by the sliding tip, which can quantitatively account for the observed friction coefficients. These results show that, once adhesion is properly accounted for, the friction coefficient is a reproducible material property that can be tuned via controlled modifications to surface and subsurface layers.