Magnetization, Curie temperature, and magnetic anisotropy of strained (111) Ni/Au superlattices.
Magnetization, Curie temperature, and magnetic anisotropy of strained (111) Ni/Au superlattices.
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应变 (111) Ni/Au 超晶格的磁化强度、居里温度和磁各向异性。
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
Jankowski
中科院分区：
文献类型：
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作者：
Childress;Chien;Jankowski
研究了双层厚度为{Lambda}{lt}5 nm的应变(111)Ni/Au超晶格的磁性能随Ni层厚度的变化关系。结果表明，Ni的饱和磁化强度与居里温度的降低成反比，而居里温度的降低遵循幂函数规律。在625-K衬底上生长的超晶格显示出比在室温下生长的超晶格具有更大的磁化强度、更高的磁化强度、更低的磁各向异性。在这两种情况下，在结构研究中观察到从相干到非相干转变的同一个{Lambda}处，各向异性突然减小。另外的结构数据表明，在这个厚度范围内，Ni层在平行和垂直于生长方向都有很强的应变，因此不遵循常规的弹性行为。这凸显了在分析短周期金属超晶格的磁性时，准确确定其结构性质的重要性。
The magnetic properties of well-characterized strained (111) Ni/Au superlattices with bilayer thickness {Lambda}{lt}5 nm are examined as a function of Ni layer thickness {ital d}{sub Ni}. The saturation magnetization of Ni is found to decrease inversely with {ital d}{sub Ni}, while the decrease in Curie temperature {ital T}{sub {ital C}} follows a power law. Superlattices grown on 625-K substrates show larger magnetization, higher {ital T}{sub {ital C}}, and lower magnetic anisotropy than ones grown at room temperature. In both cases, an abrupt decrease in the anisotropy is found at the same {Lambda} where a coherent-to-incoherent transition is observed in structural studies. Additional structural data indicate that, in this thickness region, the Ni layers are strongly strained both parallel and perpendicular to the growth direction, and thus do not follow conventional elastic behavior. This underlines the importance of an accurate determination of the structural properties when analyzing the magnetic properties of short-period metallic superlattices.