The influence of Re layer insertion either at the bottom or top interface of epitaxially grown Pt/Co/Pt heterostructures on their static and dynamic magnetic properties is discussed in terms of their crystalline structure. Magnetic properties were studied as a function of both Re and Co layer thicknesses (dRe and dCo, respectively) in the matrix-like samples with a double-wedge structure, in which the layer thickness gradients were oriented orthogonally. The comprehensive investigations of the changes in coercivity, perpendicular magnetic anisotropy, spin reorientation transition, interfacial Dzyaloshinskii-Moriya interaction (iDMI) and spin wave damping are reported. Two different magnetic phases depending on the Co layer thickness with volume anisotropies (determined without demagnetization term) of KV∼0.25 (low) and KV∼0.75 MJ/m3 (high) were observed. The relation between these phases depends on the stack sequence and thickness of Re inserted layer. For dRe = 0.2 ÷ 0.7 nm deposited as the bottom interface, dCo induced transition at dtr ∼ 2 nm from low to high volume anisotropy phases was observed. Low and high volume anisotropy phases are associated to Co fcc and hcp structural phases. The insertion of half atomic layer of Re had no influence on surface anisotropy but significantly enhanced iDMI above 1 pJ/m and reduced spin wave damping.

中文翻译：

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Re/Co/Pt 和 Pt/Co/Re 三分子层的静态和动态磁性能演变与增强的 Dzyaloshinskii-Moriya 相互作用


从其晶体结构的角度讨论了在外延生长的 Pt/Co/Pt 异质结构的底部或顶部界面插入 Re 层对其静态和动态磁性的影响。在具有双楔形结构的基质状样品中，磁性作为 Re 和 Co 层厚度（分别为 dRe 和 dCo）的函数进行研究，其中层厚度梯度是正交取向的。本文报道了矫顽力、垂直磁各向异性、自旋重新取向转变、界面 Dzyaloshinskii-Moriya 相互作用 （iDMI） 和自旋波阻尼变化的综合研究。观察到两种不同的磁相，取决于 Co 层厚度的体积各向异性（无退磁项确定）KV∼0.25（低）和 KV∼0.75 MJ/m3（高）。这些相之间的关系取决于 Re 插入层的堆栈顺序和厚度。当 dRe = 0.2 ÷ 0.7 nm 沉积为底部界面时，观察到 dCo 诱导的 dtr ∼ 2 nm 处从低体积到高体积各向异性相的转变。低体积和高体积各向异性相与 Co、fcc 和 hcp 结构相相关。插入 Re 的半原子层对表面各向异性没有影响，但显着增强了 1 pJ/m 以上的 iDMI 并降低了自旋波阻尼。