论文标题
LA $ _ {1-x} $ sr $ _x $ mno $ _3 $ thin Films在LA $ _ $ _ {1-x} $ _ $ _ $ _ $ _薄膜附近的磁相的温度演变。
Temperature evolution of magnetic phases near the thickness-dependent metal-insulator transition in La$_{1-x}$Sr$_x$MnO$_3$ thin films observed by XMCD
论文作者
论文摘要
钙钛矿型锰矿以其吸引人的物理特性（例如巨大的磁性（CMR）和一半金属性）而闻名，被认为是纺纱剂的候选材料。但是，当厚度降低到几个单层（MLS）时，它们的铁磁（FM）特性通常会在薄膜中被抑制。为了研究磁相在副磁（PM）至-FM相过渡边界附近的演变，我们在LA $ _ {1-x} $ _ {1-x} $ sr $ _ {x} $ _ {x} $ mno $ _3 $ _3 $（$ _3 $ thin thus y thum y thum y thin thy thy thy whr ys $ x $ x $ x $ x $ x $ x $ x = 0.4 $ x = 0.4 $ x = 0.4 mno）上进行了依赖温度依赖温度的X射线磁性圆形二分法（XMCD）实验。在FM金属和PM构造阶段之间。通过利用XMCD的元素 - 选择性，我们定量估计了PM和超顺磁性（SPM）阶段的分数以及FM One作为温度的函数。可以基于微观相分离模型来合理描述结果。
Perovskite-type manganites, which are well-known for their intriguing physical properties such as colossal magnetoresistance (CMR) and half metalicity, have been considered as candidate materials for spintronics. However, their ferromagnetic (FM) properties are often suppressed in thin films when the thickness is reduced down to several monolayers (MLs). In order to investigate how the magnetic phases evolve near the paramagnetic (PM)-to-FM phase transition boundary, we have performed temperature-dependent x-ray magnetic circular dichroism (XMCD) experiments on a La$_{1-x}$Sr$_{x}$MnO$_3$ (LSMO, $x=0.4$) thin film, whose thickness (8 ML) is close to the boundary between the FM-metallic and the PM-insulating phases. By utilizing the element-selectiveness of XMCD, we have quantitatively estimated the fractions of the PM and superparamagnetic (SPM) phases as well as the FM one as a function of temperature. The results can be reasonably described based on a microscopic phase-separation model.
