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Unconventional anomalous Hall effect from antiferromagnetic domain walls of Nd2Ir2O7 thin films

Title
Unconventional anomalous Hall effect from antiferromagnetic domain walls of Nd2Ir2O7 thin films
Author
천상모
Keywords
PHASE; OXIDE
Issue Date
2018-09
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v. 98, no. 12, Article no. 125103
Abstract
Ferroic domain 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://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.125103https://repository.hanyang.ac.kr/handle/20.500.11754/120059
ISSN
2469-9950; 2469-9969
DOI
10.1103/PhysRevB.98.125103
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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