Unconventional anomalous Hall effect from antiferromagnetic domain walls ofNd2Ir2O7thin films
| Autor: | Ambrose Seo, Oleksandr B. Korneta, Miyoung Kim, Tae Won Noh, Daesu Lee, J. H. Gruenewald, Sangmo Cheon, Yoonkoo Kim, Taekoo Oh, Bongju Kim, Bohm-Jung Yang, Woo Jin Kim, Je-Geun Park, Hwanbeom Cho |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Condensed matter physics Magnetic moment Exchange interaction 02 engineering and technology Spin structure 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Ferromagnetism Hall effect 0103 physical sciences Domain (ring theory) Antiferromagnetism 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 98 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.98.125103 |
| Popis: | 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, $\mathrm{N}{\mathrm{d}}_{2}\mathrm{I}{\mathrm{r}}_{2}{\mathrm{O}}_{7}$. Bulk $\mathrm{N}{\mathrm{d}}_{2}\mathrm{I}{\mathrm{r}}_{2}{\mathrm{O}}_{7}$ 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 $f\text{\ensuremath{-}}d$ exchange interaction between the Nd and Ir magnetic moments significantly influences antiferromagnetic (AFM) domain switching. Our epitaxial $\mathrm{N}{\mathrm{d}}_{2}\mathrm{I}{\mathrm{r}}_{2}{\mathrm{O}}_{7}$ 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. |
| Databáze: | OpenAIRE |
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