Magnetism and topological Hall effect in antiferromagnetic Ru2MnSn-based Heusler compounds

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:537

Article

Zhang, Wenyong^1,2  Balasubramanian, Balamurugan^1,2  Sun, Yang^3,4  Ullah, Ahsan^1,2  Skomski, Ralph^1,2  Pahari, Rabindra^1,2  Valloppilly, Shah R.¹  Li, Xing-Zhong¹  Wang, Cai-Zhuang^3,4  Ho, Kai-Ming^3,4  Sellmyer, David J.^1,2 

[1] Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA

[2] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA

[3] Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA

[4] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

关键词: Heusler compounds;    Antiferromagnetism;    Topological Hall effect;   

DOI  :  10.1016/j.jmmm.2021.168104

来源: Elsevier

【 摘 要 】

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.

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