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arXiv 1210.2240cond-mat.mtrl-sci
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溅射气压对单靶沉积Sm-Co薄膜性能的影响

Sputter gas pressure effects on the properties of Sm-Co thin films deposited from a single target

T. G. A. Verhagen, D. B. Boltje, J. M. van Ruitenbeek, J. Aarts

摘要:

采用溅射沉积法在Cr(100)缓冲MgO(100)单晶衬底上生长Sm-Co薄膜。通过改变Ar气体的压力,我们可以改变膜的组成从SmCo 5类Sm 2Co 7类相。用卢瑟福背散射、X射线衍射和磁化强度测量等方法对薄膜的组成、晶体结构、形貌和磁性能进行了表征。我们发现,各种性质是敏感的溅射背景压力在不同的方式。特别地,晶格参数以连续的方式变化,矫顽场连续变化,最大值为3.3 T,但饱和磁化强度在晶格参数接近Sm 2Co 7时达到峰值。此外,我们发现,Sm含量的薄膜是高于预期的化学计量比。

英文摘要:

We grow epitaxial Sm-Co thin films by sputter deposition from an alloy target with a nominal SmCo5 composition on Cr(100)-buffered MgO(100) single-crystal substrates. By varying the Ar gas pressure, we can change the composition of the film from a SmCo5-like to a Sm2Co7-like phase. The composition, crystal structure, morphology and magnetic properties of these films have been determined using Rutherford Backscattering, X-ray diffraction and magnetization measurements. We find that the various properties are sensitive to the sputter background pressure in different ways. In particular, the lattice parameter changes in a continuous way, the coercive fields vary continuously with a maximum value of 3.3 T, but the saturation magnetization peaks when the lattice parameter is close to that of Sm2Co7. Moreover, we find that the Sm content of the films is higher than expected from the expected stoichiometry.

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