论文标题
钯薄膜的表面和底物界面上的灵恩场增加
Increased muon field at surface and substrate interface of palladium thin films
论文作者
论文摘要
我们对三个钯100 nm薄膜进行了深度依赖性的低能MUON自旋光谱法（$μ$ SR）研究，这些薄膜均未掺杂，并用170 ppm的铁掺杂。与样品的内部相比，植入表面和底物界面区域探测局部磁场增加的兆子探针增加了局部磁场。田间增加在几纳米上延伸，它是与温度无关的（在3.7-100 k的范围内），对铁掺杂的样品更强，并伴随着局部场不均匀性的增加。我们考虑了这种磁体表面状态的各种潜在起源，例如吸附剂和倒置的D型态。我们的结论是，局部旋转和电荷在表面 /界面诱导的轨道力矩是最有可能的解释，可能伴随着由于晶体不规则而引起的磁矩。
We performed depth-dependent low-energy muon spin spectroscopy ($μ$SR) studies on three palladium 100 nm thin films, both undoped and doped with 170 ppm of iron. Muons implanted in the surface and substrate interface region probe an increased local magnetic field compared to the inner part of the sample. The field increase extends over a few nanometers, it is temperature-independent (in the range of 3.7 - 100 K), stronger for the iron-doped samples and accompanied by an increase in local field inhomogeneity. We consider various potential origins for this magnetic surface state, such as adsorbents and supressed d-states. Our conclusion is that orbital moments induced at the surface / interface by localized spins and charges are the most likely explanation, potentially accompanied by magnetic moments due to crystal irregularities.
