Tunable magnetic and transport properties of Mn3Ga thin films on Ta/Ru seed layer
Tunable magnetic and transport properties of Mn3Ga thin films on Ta/Ru seed layer
复制标题
Ta/Ru 种子层上 Mn3Ga 薄膜的可调谐磁性和传输特性
DOI：
10.1063/1.5005895
复制
发表时间：
2018
影响因子：
3.2
通讯作者：
Xu Feng
中科院分区：
文献类型：
--
作者：
Hu Fang;Xu Guizhou;You Yurong;Zhang Zhi;Xu Zhan;Gong Yuanyuan;Liu Er;Zhang Hongguo;Liu Enke;Wang Wenhong;Xu Feng
具有大的反常和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。大的介电常数与大的反常霍尔电阻率一起被发现在具有混合的四方相的仅Ta的样品中。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。提出了反常霍尔特性的概念。
Hexagonal D019-type Mn3Z alloys that possess large anomalous and topological-like Hall effects have attracted much attention due to their great potential in antiferromagnetic spintronic devices. Herein, we report the preparation of Mn3Ga films in both tetragonal and hexagonal phases with a tuned Ta/Ru seed layer on a thermally oxidized Si substrate. Large coercivity together with large anomalous Hall resistivity is found in the Ta-only sample with a mixed tetragonal phase. By increasing the thickness of the 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 200 K. The abnormal Hall properties are propos...