Formation of Mn-rich interfacial phases in Co2FexMn1-xSi thin films
Formation of Mn-rich interfacial phases in Co2FexMn1-xSi thin films
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Co2FexMn1-xSi 薄膜中富锰界面相的形成
DOI:
10.1016/j.jmmm.2024.171884
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发表时间:
2024
影响因子:
2.7
通讯作者:
Hauser, Adam J.
中科院分区:
文献类型:
--
作者:
Ming Law, Ka;Thind, Arashdeep S.;Pendharkar, Mihir;Patel, Sahil J.;Phillips, Joshua J.;Palmstrom, Chris J.;Gazquez, Jaume;Borisevich, Albina;Mishra, Rohan;Hauser, Adam J.
We report the formation of Mn-rich regions at the interface of Co2FexMn1-xSi thin films grown on GaAs substrates by molecular beam epitaxy (MBE). Scanning transmission electron microscopy (STEM) with electron energy loss (EEL) spectrum imaging reveals that each interfacial region: (1) is 1–2 nm wide, (2) occurs irrespective of the Fe/Mn composition ratio and in both Co-rich and Co-poor films, and (3) displaces both Co and Fe indiscriminately. We also observe a Mn-depleted region in each film directly above each Mn-rich interfacial layer, roughly 3 nm in width in the x = 0 and x = 0.3 films, and 1 nm in the x = 0.7 (less Mn) film. We posit that growth energetics favor Mn diffusion to the interface even when there is no significant Ga interdiffusion into the epitaxial film. Element-specific X-ray magnetic circular dichroism (XMCD) measurements show larger Co, Fe, and Mn orbital to spin magnetic moment ratios compared to bulk values across the Co2FexMn1-xSi compositional range. The values lie between reported values for pure bulk and nanostructured Co, Fe, and Mn materials, corroborating the non-uniform, layered nature of the material on the nanoscale. Finally, SQUID magnetometry demonstrates that the films deviate from the Slater-Pauling rule for uniform films of both the expected and the measured composition. The results inform a need for care and increased scrutiny when forming Mn-based magnetic thin films on III-V semiconductors like GaAs, particularly when films are on the order of 5 nm or when interface composition is critical to spin transport or other device applications.
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