In the present study were studied the ferromagnetic La_1−xSr_x (Mn_1−yCo_y)_zO₃ (LSMCO) films with Co content y = 0 to 0.18, grown on LaAlO₃ substrates by advantageous pulsed‐injection metalorganic chemical vapor deposition technique. The LSMCO films exhibit negative colossal magnetoresistance effect; therefore, they are interesting as potential material for the applications in magnetic field sensing. The changes of lattice volume in the investigated LSMCO films were monitored by X‐ray diffraction measurements revealing a transition from tensile to compressive strain with increase of Co content. Additionally, from the atomic force microscopy images, the surface smoothening with increase of y was determined. Despite the reduction of the out‐of‐plane lattice parameter of LSMCO, the increase of lattice volume in the whole Co‐doping range was observed. The X‐ray photoelectron spectroscopy combined with Ar⁺ ion sputtering was used for the investigation of chemical composition of the LSMCO films and demonstrated the change and redistribution of oxidation states of Mn and Co on the surface and in the volume of the films. Regardless of the structural changes and charge distribution of Co and Mn cations, epitaxial LSMCO exhibits ferromagnetic properties and magnetoresistance values increases with augmenting Co content in the range of y = 0 to 0.18.

中文翻译：

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外延La1-xSrx（Mn1-yCoy）zO3薄膜的表面和结构分析

在本研究中，研究了在LaAlO _3上生长的Co含量为y = 0至0.18的铁磁La _{1- x} Sr _x（Mn _{1- y} Co _y）_z O ₃（LSMCO）薄膜。通过有利的脉冲注入金属有机化学气相沉积技术处理基材。LSMCO膜表现出负的巨大磁阻效应；因此，它们作为在磁场传感中的潜在材料很有意思。通过X射线衍射测量监测了研究的LSMCO薄膜中晶格体积的变化，揭示了随着Co含量的增加，从拉伸应变到压缩应变的转变。另外，从原子力显微镜图像确定了随着y的增加而使表面平滑。尽管降低了LSMCO的平面外晶格参数，但在整个Co掺杂范围内仍观察到晶格体积的增加。X射线光电子能谱结合Ar ⁺离子溅射用于研究LSMCO膜的化学成分，并证明了Mn和Co的氧化态在膜的表面和体积中的变化和重新分布。不论Co和Mn阳离子的结构变化和电荷分布如何，外延LSMCO均表现出铁磁性能，并且随着Co含量在y = 0至0.18范围内的增加，磁阻值也会增加。