Giant room temperature anomalous Hall effect and tunable topology in a ferromagnetic topological semimetal Co2MnAl

Weyl semimetals exhibit unusual surface states and anomalous transport phenomena. It is hard to manipulate the band structure topology of specific Weyl materials. Topological transport phenomena usually appear at very low temperatures, which sets challenges for applications. In this work, we demonst...

Full description

Saved in:
Bibliographic Details
Published in:Nature communications 2020-07, Vol.11 (1), p.3476-3476, Article 3476
Main Authors: Li, Peigang, Koo, Jahyun, Ning, Wei, Li, Jinguo, Miao, Leixin, Min, Lujin, Zhu, Yanglin, Wang, Yu, Alem, Nasim, Liu, Chao-Xing, Mao, Zhiqiang, Yan, Binghai
Format: Article
Language:English
Subjects:
639/301/119/2792/4128
639/766/119/2792/4128
Conductors
Electromagnetism
Ferromagnetism
Hall effect
Humanities and Social Sciences
Low temperature
Magnetic fields
MATERIALS SCIENCE
Metalloids
multidisciplinary
Room temperature
Science
Science (multidisciplinary)
Topology
Transport phenomena
Transport properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Weyl semimetals exhibit unusual surface states and anomalous transport phenomena. It is hard to manipulate the band structure topology of specific Weyl materials. Topological transport phenomena usually appear at very low temperatures, which sets challenges for applications. In this work, we demonstrate the band topology modification via a weak magnetic field in a ferromagnetic Weyl semimetal candidate, Co 2 MnAl, at room temperature. We observe a tunable, giant anomalous Hall effect (AHE) induced by the transition involving Weyl points and nodal rings. The AHE conductivity is as large as that of a 3D quantum AHE, with the Hall angle ( Θ H ) reaching a record value ( tan Θ H = 0.21 ) at the room temperature among magnetic conductors. Furthermore, we propose a material recipe to generate large AHE by gaping nodal rings without requiring Weyl points. Our work reveals an intrinsically magnetic platform to explore the interplay between magnetic dynamics and topological physics for developing spintronic devices. Band topology of Weyl semimetals is usually predetermined by material parameters and can hardly be manipulated, and their transport properties appear at low temperature. Here, the authors modify the topology via a weak magnetic field and observe a giant anomalous Hall effect at room temperature.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-17174-9