A perpendicularly magnetized ferromagnetic layer is an important building block for recent/future high-density spintronic memory applications. This paper reports the fabrication of perpendicularly magnetized Ni/Pt superlattices and the characterization of their structures and magnetic properties. The optimization of film growth conditions allowed us to grow epitaxial Ni/Pt (001) superlattices on $\mathrm{SrTi}{\mathrm{O}}_3$ (001) single-crystal substrates. We investigated their structural parameters and magnetic properties as a function of the Ni layer thickness and obtained a high uniaxial magnetic anisotropy energy of $1.9\times {10}^6\mathrm{erg}/\mathrm{c}{\mathrm{m}}^3$ for a [Ni (4.0 nm)/Pt (1.0 nm)] superlattice. In order to elucidate the detailed mechanism on perpendicular magnetic anisotropy for the Ni/Pt (001) superlattices, the experimental results were compared with the first-principles calculations. It has been found that the strain effect is a prime source of the emergence of perpendicular magnetic anisotropy.

中文翻译：

---

垂直磁化的Ni / Pt（001）外延超晶格

垂直磁化的铁磁层是近来/未来高密度自旋电子存储器应用的重要组成部分。本文报道了垂直磁化的Ni / Pt超晶格的制备及其结构和磁性能的表征。薄膜生长条件的优化使我们能够在衬底上生长外延Ni / Pt（001）超晶格$\mathrm{锶钛}{\mathrm{Ø}}_3$（001）单晶衬底。我们研究了它们的结构参数和磁性能随Ni层厚度的变化，并获得了高的单轴磁各向异性能。$1.9\times {10}^6\mathrm{尔格}/\mathrm{C}{\mathrm{米}}^3$[Ni（4.0 nm）/ Pt（1.0 nm）]超晶格。为了阐明Ni / Pt（001）超晶格的垂直磁各向异性的详细机理，将实验结果与第一性原理计算进行了比较。已经发现，应变效应是垂直磁各向异性出现的主要来源。