La_2/3Sr_1/3MnO₃ (LSMO) thin films of various thicknesses (6, 8, 10, 20, and 30 nm), capped by 7 nm‐thick Pt layer, are grown by pulsed laser deposition on SrTiO₃ (001) substrates. X‐ray diffraction revealed that LSMO films are (001) oriented. Vibrating sample magnetometer is used to determine the magnetization at saturation and the magnetic dead layer thickness. This latter is around 3.4 nm, significantly thicker compared with the one induced at interfaces of Pt with ferromagnetic transition metals. Microstrip line ferromagnetic resonance (MS‐FMR) is used to extract the gyromagnetic ratio, which is found to increase with LSMO thickness. MS‐FMR revealed that the in‐plane magnetic anisotropy is dominated by a uniaxial contribution for the Pt capped film, whereas the noncapped 10 nm‐thick LSMO layer shows a fourfold anisotropy. Furthermore, the thickness dependence of the effective magnetization reveals the existence of a second‐order perpendicular anisotropy term, which is thickness‐dependent, and of a weak uniaxial interface anisotropy. The Gilbert damping coefficient is found to vary linearly with the inverse of the effective LSMO thickness due to spin pumping leading to relatively low spin mixing conductance of LSMO/Pt interface.

中文翻译：

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La2 / 3Sr1 / 3MnO3 / Pt系统中的自旋泵浦和磁各向异性

通过在SrTiO ₃上脉冲激光沉积来生长厚度为7 nm的Pt层的各种厚度（6、8、10、20和30 nm）的La _2/3 Sr _1/3 MnO ₃（LSMO）薄膜（001）个基材。X射线衍射表明LSMO薄膜是（001）取向的。振动样品磁力计用于确定饱和时的磁化强度和磁死层厚度。后者约为3.4 nm，与在Pt与铁磁过渡金属的界面处感应到的相比，厚得多。微带线铁磁共振（MS-FMR）用于提取旋磁比，发现该比随LSMO厚度的增加而增加。MS-FMR表明，面内磁各向异性受Pt盖膜的单轴贡献支配，而未盖10 nm厚的LSMO层则表现出四倍的各向异性。此外，有效磁化强度的厚度依赖性揭示了存在一个二阶垂直各向异性项，该项与厚度有关，并且具有弱的单轴界面各向异性。发现吉尔伯特阻尼系数与有效LSMO厚度的倒数线性相关，这是由于自旋泵浦导致LSMO / Pt界面的自旋混合电导相对较低。