Unconventional anomalous Hall effect from antiferromagnetic domain walls of Nd2Ir2O7 thin films
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SCOPUS
- Title
- Unconventional anomalous Hall effect from antiferromagnetic domain walls of Nd2Ir2O7 thin films
- Authors
- Kim, W. J.; Gruenewald, J. H.; Oh, T.; Chen, S.; Kim, B.; Korneta, O. B.; Cho, H.; LEE, DAESU; Kim, Y.; Kim, M.; Park, J.-G.; Yang, B.-J.; Seo, A.; Noh, T. W.
- Date Issued
- 2018-09
- Publisher
- AMER PHYSICAL SOC
- Abstract
- Ferroicdomain walls (DWs) create different symmetries and ordered states compared with those in singledomain bulk materials. In particular, the DWs of an antiferromagnet with noncoplanar spin structure have a distinct symmetry that cannot be realized in those of their ferromagnet counterparts. In this paper, we show that an unconventional anomalous Hall effect (AHE) can arise from the DWs of a noncoplanar antiferromagnet, Nd2Ir2O7. Bulk Nd2Ir2O7 has a cubic symmetry; thus, its Hall signal should be zero without an applied magnetic field. The DWs generated in this material break the twofold rotational symmetry, which allows for finite anomalous Hall conductivity. A strong f-d exchange interaction between the Nd and Ir magnetic moments significantly influences antiferromagnetic (AFM) domain switching. Our epitaxial Nd2Ir2O7 thin film showed a large enhancement of the AHE signal when the AFM domains switched, indicating that the AHE is mainly due to DWs. Our paper highlights the symmetry-broken interface of AFM materials as a means of exploring topological effects and their relevant applications.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/94952
- DOI
- 10.1103/PhysRevB.98.125103
- ISSN
- 1098-0121
- Article Type
- Article
- Citation
- PHYSICAL REVIEW B, vol. 98, no. 12, 2018-09
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