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arXiv 1801.01233cond-mat.mtrl-sci
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Ta/Ru种子层上Mn3Ga薄膜的磁性和输运特性

Tunable magnetic and transport properties of Mn3Ga thin films on Ta/Ru seedlayer

Fang Hu, Guizhou Xu, Yurong You, Zhi Zhang, Zhan Xu, Yuanyuan Gong, Er Liu, Hongguo Zhang, Enke Liu, Wenhong Wang, Feng Xu

摘要:

具有大的反常和类拓扑霍尔效应的异质D 019型Mn 3 Z合金在反铁磁自旋电子学器件中具有巨大的应用潜力,引起了人们的广泛关注。在这里,我们报告的Mn 3Ga薄膜的制备在四角和六角相与调谐Ta/Ru种子层上的热氧化的Si衬底。在纯Ta掺杂的混合四方相样品中发现了大的介电常数和大的反常霍耳电阻率。随着Ru层厚度的增加,Ta(5)/Ru(30)缓冲样品中的四方相逐渐消失,得到相对纯的六方相。进一步的磁性和输运测量表明,在纯六方样品中,反常的霍尔电导几乎消失,而在低场区出现异常的非对称驼峰结构。提取的附加霍尔项在大的温度范围内是鲁棒的,并且在200 K以上呈现符号反转。D 019 Mn 3Ga的反常霍尔特性与其自旋阻挫结构密切相关。

英文摘要:

Hexagonal D019-type Mn3Z alloys that possess large anomalous and topological-like Hall effects have attracted much attention due to their great potential in the antiferromagnetic spintronic devices. Here, we report the preparation of Mn3Ga film in both tetragonal and hexagonal phases with a tuned Ta/Ru seed layer on the thermally oxidized Si substrate. A large coercivity together with a large anomalous Hall resistivity is found in the Ta-only sample with mixed tetragonal phase. By increasing the thickness of Ru layer, the tetragonal phase gradually disappears and a relatively pure hexagonal phase is obtained in the Ta(5)/Ru(30) buffered sample. Further magnetic and transport measurements revealed that the anomalous Hall conductivity nearly vanishes in the pure hexagonal sample, while an abnormal asymmetric hump structure emerges in the low field region. The extracted additional Hall term is robust in a large temperature range and presents a sign reversal above 200K. The abnormal Hall properties are proposed to be closely related with the frustrated spin structure of D019 Mn3Ga.

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