Finding order in disorder: Magnetic coupling distributions and competing anisotropies in an amorphous metal alloy
Finding order in disorder: Magnetic coupling distributions and competing anisotropies in an amorphous metal alloy
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在无序中寻找秩序：非晶金属合金中的磁耦合分布和竞争各向异性
DOI：
10.1063/5.0078748
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发表时间：
2022
期刊：
影响因子：
6.1
通讯作者：
F. Magnus
中科院分区：
文献类型：
--
作者：
K. Thorarinsdottir;N. Strandqvist;V. V. Sigurjónsdóttir;E. B. Thorsteinsson;B. Hjörvarsson;F. Magnus
非晶态金属具有不寻常的磁性，这是由于无序的原子排列引起的。我们发现，Co x（Al 70 Zr 30）100− x（65 < x < 92 at. %）非晶合金在局部磁耦合和有序温度中具有分布，这可以用纳米级成分变化来解释。我们使用竞争的各向异性引起的基板和生长过程中的外加电场探测的Co浓度分布。只有具有足够高的Co浓度的区域在生长期间沿着磁场沿着发展磁各向异性，而低Co浓度的区域具有由衬底决定的各向异性。从各向异性的变化中获得宽度为5.1原子%的Co浓度的高斯分布。结果表明，组成变化的重要性，涌现的磁性和无序材料的一般性质具有深远的影响。
Amorphous metals have unusual magnetic properties that arise due to the disordered atomic arrangement. We show that Co x(Al70Zr30)100− x (65 < x < 92 at. %) amorphous alloys have a distribution in the local magnetic coupling and ordering temperature, which can be explained by nanoscale composition variations. We use competing anisotropies induced by the substrate and an applied field during growth to probe the Co concentration distribution. Only regions with high enough Co concentration develop a magnetic anisotropy along the magnetic field during growth, whereas regions of low Co concentration have an anisotropy dictated by the substrate. A Gaussian distribution in the Co concentration of width 5.1 at. % is obtained from the variation in anisotropy. The results demonstrate the importance of composition variations for emergent magnetic properties and have far reaching implications for the properties of disordered materials in general.