Fabrication of polycrystalline Weyl antiferromagnetic Mn3Sn thin films on various seed layers
Fabrication of polycrystalline Weyl antiferromagnetic Mn3Sn thin films on various seed layers
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DOI：
10.1103/physrevmaterials.5.054402
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发表时间：
2021-05-07
影响因子：
3.4
通讯作者：
Yakushiji, Kay
中科院分区：
文献类型：
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作者：
Nakano, Takafumi;Higo, Tomoya;Yakushiji, Kay
为了开发高质量的Weyl磁体Mn 3Sn薄膜，将多晶Mn-Sn溅射沉积到Pt、Cu、Ir、Ru、Cr或Al的fcc或六方密排金属种子层上。Pt和Cu使具有光滑表面的高度c面取向的D 0（19）型Mn 3Sn薄膜的制备成为可能（平均粗糙度低于0.3nm）。Mn 3Sn薄膜表现出明显的反常能斯特效应（ANE）信号，这是外尔磁体的一个特征。微观结构分析表明，Cu种子层显着扩散到Mn 3Sn层在退火后，而Pt种子层变化不大。结果表明，少量的Cu混合物（高达2.5 at. %）没有降低ANE信号，但有效地降低了退火后温度以形成D 0（19）结构。所开发的薄膜和技术在磁性随机存取存储器的标准工艺中的平滑性和工艺一致性方面对于反铁磁自旋电子学是有益的。
To develop a high-qualityWeyl magnet Mn3Sn thin film, polycrystalline Mn-Sn was sputter deposited onto an fcc or hexagonal close-packed metallic seed layer of Pt, Cu, Ir, Ru, Cr, or Al. Among the tested seed materials, Pt and Cu enabled fabrication of highly c-plane oriented textured D0(19)-type Mn3Sn films with a smooth surface (mean roughness below 0.3 nm) after postannealing at 350 degrees C or below. The Mn3Sn films exhibited substantial signals of the anomalous Nernst effect (ANE), which is one characteristic of a Weyl magnet. Microstructural analysis revealed that the Cu seed layer significantly diffused into the Mn3Sn layer during postannealing, while the Pt seed layer changed little. The results suggested that a small amount of Cu mixture (up to 2.5 at. %) did not degrade the ANE signal but effectively lowered the postannealing temperature to form the D0(19) structure. The developed films and techniques are beneficial for antiferromagnetic spintronics in terms of the smoothness and process consistency in a standard process for magnetic random-access memory.