TY - JOUR
T1 - Unconventional anomalous Hall effect from antiferromagnetic domain walls of N d2 i r2 O7 thin films
AU - Kim, Woo Jin
AU - Gruenewald, John H.
AU - Oh, Taekoo
AU - Cheon, Sangmo
AU - Kim, Bongju
AU - Korneta, Oleksandr B.
AU - Cho, Hwanbeom
AU - Lee, Daesu
AU - Kim, Yoonkoo
AU - Kim, Miyoung
AU - Park, Je Geun
AU - Yang, Bohm Jung
AU - Seo, Ambrose
AU - Noh, Tae Won
N1 - Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/9/4
Y1 - 2018/9/4
N2 - Ferroic domain walls (DWs) create different symmetries and ordered states compared with those in single-domain 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.
AB - Ferroic domain walls (DWs) create different symmetries and ordered states compared with those in single-domain 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.
UR - http://www.scopus.com/inward/record.url?scp=85053125938&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85053125938&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.98.125103
DO - 10.1103/PhysRevB.98.125103
M3 - Article
AN - SCOPUS:85053125938
SN - 2469-9950
VL - 98
JO - Physical Review B
JF - Physical Review B
IS - 12
M1 - 125103
ER -