Due to its nontrivial topological state, a magnetic Weyl semimetal often exhibits exotic transport properties that are important for both fundamental physics and potential spintronics applications. In this Letter, we investigate the composition dependences of the structural order, magnetism, and transport properties for the epitaxial Heusler alloy CoxMnGay (CMG) topological Weyl semimetal films grown via molecular beam epitaxy. Our results show that the saturated magnetization, anomalous Hall conductivity, and anomalous Hall angle of CMG are influenced by its composition and structural order. Specifically, we observed that the optimized L21–Co2MnGa alloy exhibits a high intrinsic anomalous Hall conductivity of approximately 913 Ω−1 cm−1 at its maximum, which is attributed to the substantial Berry curvature within its electronic band structures. This study provides valuable insights into how to engineer the topological ferromagnetic state of the Weyl semimetals for future applications.
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22 April 2024
Research Article|
April 25 2024
Engineering the topological states of Weyl ferromagnetic CoxMnGay films grown by molecular beam epitaxy
Special Collection:
Topological and Chiral Matter – Physics and Applications
Lizhu Ren
;
Lizhu Ren
a)
(Conceptualization, Data curation, Investigation, Writing – original draft)
1
Department of Electrical and Computer Engineering, National University of Singapore
, 117576 Singapore
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Tieyang Zhao
;
Tieyang Zhao
(Data curation, Formal analysis, Software, Writing – original draft)
2
Department of Materials Science and Engineering, National University of Singapore
, 117575 Singapore
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Jingsheng Chen
;
Jingsheng Chen
(Funding acquisition, Project administration, Resources, Supervision, Writing – review & editing)
2
Department of Materials Science and Engineering, National University of Singapore
, 117575 Singapore
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Kie Leong Teo
Kie Leong Teo
a)
(Project administration, Resources, Supervision, Writing – original draft, Writing – review & editing)
1
Department of Electrical and Computer Engineering, National University of Singapore
, 117576 Singapore
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Appl. Phys. Lett. 124, 172408 (2024)
Article history
Received:
January 31 2024
Accepted:
April 18 2024
Citation
Lizhu Ren, Tieyang Zhao, Jingsheng Chen, Kie Leong Teo; Engineering the topological states of Weyl ferromagnetic CoxMnGay films grown by molecular beam epitaxy. Appl. Phys. Lett. 22 April 2024; 124 (17): 172408. https://doi.org/10.1063/5.0201711
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