Magnetism and topological Hall effect in antiferromagnetic Ru2MnSn-based Heusler compounds
Magnetism and topological Hall effect in antiferromagnetic Ru2MnSn-based Heusler compounds
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DOI：
10.1016/j.jmmm.2021.168104
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发表时间：
2021-06-03
影响因子：
2.7
通讯作者：
Sellmyer, David J.
中科院分区：
文献类型：
--
作者：
Zhang, Wenyong;Balasubramanian, Balamurugan;Sellmyer, David J.
Heusler化合物和基于它们的合金最近引起了极大的兴趣，因为它们表现出各种各样的自旋结构、磁性和电子输运现象。它们的性能可以通过合金化来调节。我们通过改变Mn：Sn的原子组成来研究L2（1）有序化合物Ru_2MnSn及其合金。虽然在Ru2MnSn中观察到反铁磁有序的Neel温度为361 K，但Mnpoor Ru2Mn0.8Sn1.2合金表现出稀释反铁磁体的性质，其中存在未补偿Mn自旋的局部区域。此外，一个非共面的自旋结构，从拓扑霍尔效应的室温霍尔电阻率的贡献是显而易见的，实现在Ru2Mn0.8Sn1.2。我们结合实验和理论分析表明，在Ru2Mn0.8Sn1.2合金，磁性能可以解释在一个非共面反铁磁模式，它创建了一个小的净磁化在磁场中，随后产生一个Berry曲率与强拓扑霍尔效应。
Heusler compounds and alloys based on them are of great recent interest because they exhibit a wide variety of spin structures, magnetic properties, and electron-transport phenomena. Their properties are tunable by alloying and we have investigated L2(1)-orderd compound Ru2MnSn and its alloys by varying the atomic Mn:Sn composition. While antiferromagnetic ordering with a Neel temperature of 361 K was observed in Ru2MnSn, the Mnpoor Ru2Mn0.8Sn1.2 alloy exhibits properties of a diluted antiferromagnet in which there are localized regions of uncompensated Mn spins. Furthermore, a noncoplanar spin structure, evident from a topological Hall-effect contribution to the room-temperature Hall resistivity, is realized in Ru2Mn0.8Sn1.2. Our combined experimental and theoretical analysis shows that in the Ru2Mn0.8Sn1.2 alloy, the magnetic properties can be explained in terms of a noncoplanar antiferromagnetic scissor mode, which creates a small net magnetization in a magnetic field and subsequently yields a Berry curvature with a strong topological Hall effect.