Observation of Giant Topological Hall Effect in Room-Temperature Ferromagnet Cr_(0.82)Te  

作　　者：苗伟婷 甄伟立 陆振 王恒宁 王杰 牛群 田明亮 Wei-Ting Miao;Wei-Li Zhen;Zhen Lu;Heng-Ning Wang;Jie Wang;Qun Niu;Ming-Liang Tian(Anhui Key Laboratory of Low-energy Quantum Materials and Devices,High Magnetic Field Laboratory,HFIPS,Chinese Academy of Sciences,Hefei 230031,China;Science Island Branch,Graduate School of University of Science and Technology of China,Hefei 230026,China;School of Physics and Optoelectronic Engineering,Anhui University,Hefei 230601,China)

机构地区：[1]Anhui Key Laboratory of Low-energy Quantum Materials and Devices,High Magnetic Field Laboratory,HFIPS,Chinese Academy of Sciences,Hefei 230031,China [2]Science Island Branch,Graduate School of University of Science and Technology of China,Hefei 230026,China [3]School of Physics and Optoelectronic Engineering,Anhui University,Hefei 230601,China

出　　处：《Chinese Physics Letters》2024年第6期128-140,共13页中国物理快报（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2022YFA1602603);the Basic Research Program of the Chinese Academy of Sciences Based on Major Scientific Infrastructures(Grant No.JZHKYPT-2021-08);the National Natural Science Foundation of China(Grant No.12104459);the Excellent Program of Hefei Science Center CAS(Grant No.2021HSC-CIP016)。

摘　　要：Novel magnetic materials with non-trivial magnetic structures have led to exotic magnetic transport properties and significantly promoted the development of spintronics in recent years.Among them is the Crx Tey family,the magnetism of which can persist above room temperature,thus providing an ideal system for potential spintronic applications.Here we report the synthesis of a new compound,Cr_(0.82)Te,which demonstrates a record-high topological Hall effect at room temperature in this family.Cr_(0.82)Te displays soft ferromagnetism below the Curie temperature of 340 K.The magnetic measurement shows an obvious magneto-crystalline anisotropy with the easy axis located in the ab plane.The anomalous Hall effect can be well explained by a dominating skew scattering mechanism.Intriguing,after removing the normal Hall effect and anomalous Hall effect,a topological Hall effect can be observed up to 300 K and reaches up to 1.14μΩ·cm at 10 K,which is superior to most topological magnetic structural materials.This giant topological Hall effect possibly originates from the noncoplanar spin configuration during the spin flop process.Our work extends a new Cr_(x)Te_(y) system with topological non-trivial magnetic structure and broad prospects for spintronics applications in the future.

关 键 词：mechanism process TOPOLOGICAL 

分 类 号：O469[理学—凝聚态物理]