Giant unconventional Hall effect in DyFeO3/LaAlO3/SrTiO3 two-dimensional electron system via proximity-induced emergent field
Source abstract
Abstract
Abstract Two-dimensional electrons formed at the heterointerfaces of transition metal oxides have been the focus of intensive studies in condensed matter physics since their discovery at LaAlO 3 /SrTiO 3 . In particular, various attempts have been made to integrate magnetic properties with such two-dimensional electrons, aiming at exploring spintronic functions. Here we demonstrate a novel approach to realize the spin-polarized two-dimensional electron system at the LaAlO 3 /SrTiO 3 interface by the proximity effect of emergent magnetic fields from adjacent DyFeO 3 . We observed an unconventional anomalous Hall effect with a remarkable Hall angle of ~20%, resulting from the combination of high-mobility carriers in LaAlO 3 /SrTiO 3 and the emergent magnetic fields from non-coplanar canted antiferromagnetic spin textures in DyFeO 3 . These findings demonstrate a viable route toward oxide‑based spintronic functionalities by exploiting proximity‑induced emergent fields in two‑dimensional electron systems.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Electronic and Structural Properties of Oxides · Advanced Condensed Matter Physics · Topological Materials and Phenomena
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
Show source-provided references
1. Ohtomo, A. & Hwang, H. Y. A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface. Nature 427, 423 (2004).10.1038/nature02308 ↗
2. Caviglia, A. D. et al. Tunable Rashba spin-orbit interaction at oxide interfaces. Phys. Rev. Lett. 104, 126803 (2010).10.1103/PhysRevLett.104.126803 ↗
3. Lesne, E. et al. Highly efficient and tunable spin-to-charge conversion through Rashba coupling at oxide interfaces. Nat. Mater. 15, 1261 (2016).10.1038/nmat4726 ↗
4. Gray, M. T. et al. Quasi-two-dimensional electron gas behavior in doped LaAlO3 thin films on SrTiO3 substrates. Appl. Phys. Lett. 102, 131601 (2013).10.1063/1.4800232 ↗
5. Kumar, P. et al. Enhanced spin–orbit coupling and charge carrier density suppression in LaAl1−xCrxO3/SrTiO3 hetero-interfaces. J. Phys.: Condens. Matter 27, 125007 (2015).
6. Yan, H. et al. Modulated transport behavior of two-dimensional electron gas at Ni-Doped LaAlO3/SrTiO3 heterointerfaces. ACS Appl. Mater. Interfaces 9, 39011 (2017).10.1021/acsami.7b11727 ↗
7. Yan, H. et al. Magnetism control by doping in LaAlO3/SrTiO3 heterointerfaces. ACS Appl. Mater. Interfaces 10, 14209 (2018).10.1021/acsami.8b03275 ↗
8. Gan, Y. et al. Diluted oxide interfaces with tunable ground states. Adv. Mater. 31, 1805970 (2019).10.1002/adma.201805970 ↗
9. Fix, T., MacManus-Driscoll, J. L. & Blamire, M. G. Delta-doped LaAlO3/SrTiO3 interfaces. Appl. Phys. Lett. 94, 172101 (2009).10.1063/1.3126445 ↗
10. Gray, M. T. et al. Electronic and magnetic phenomena at the interface of LaAlO3 and Ru doped SrTiO3. Appl. Phys. Lett. 107, 241603 (2015).10.1063/1.4938133 ↗
11. Zhang, H. et al. Magnetic two-dimensional electron gases with high Curie temperatures at LaAlO3/SrTiO3:Fe interfaces. Phys. Rev. B 97, 155150 (2018).10.1103/PhysRevB.97.155150 ↗
12. Stornaiuolo, D. et al. Tunable spin polarization and superconductivity in engineered oxide interfaces. Nat. Mater. 15, 278 (2016).10.1038/nmat4491 ↗
13. Zhang, H. R. et al. two-dimensional electron gas at the manganite-buffered LaAlO3/SrTiO3 interface, Phys. Rev. B 96, 195167 (2017).10.1063/1.5044626 ↗
14. Moetakef, P. et al. Carrier-controlled ferromagnetism in SrTiO3. Phys. Rev. X 2, 021014 (2012).
15. Gunkel, F. et al. Defect control of conventional and anomalous electron transport at complex oxide interfaces. Phys. Rev. X 6, 031035 (2016).
16. Nagaosa, N. et al. Anomalous Hall effect. Rev. Mod. Phys. 82, 1539 (2010).10.1103/RevModPhys.82.1539 ↗
17. Šmejkal, L. et al. Anomalous Hall antiferromagnets. Nat. Rev. Mater. 7, 482 (2022).10.1038/s41578-022-00430-3 ↗
18. Ohno, M., Fujita, T. C. & Kawasaki, M. Proximity effect of emergent field from spin ice in an oxide heterostructure. Sci. Adv. 10, eadk6308 (2024).10.1126/sciadv.adk6308 ↗
19. Fujita, T. C., Omura, K. & Kawasaki, M. Topological Hall effect in a non-magnetic metal interfaced to a canted antiferromagnetic insulator in perovskite oxide heterostructures. Appl. Phys. Lett. 125, 011602 (2024).10.1063/5.0214345 ↗
20. Wang, J. et al. Simultaneous occurrence of multiferroism and short-range magnetic order in DyFeO3. Phys. Rev. B 93, 140403 (2016).10.1103/PhysRevB.93.140403 ↗
21. Bertaut, E. F. Representation analysis of magnetic structures. Acta Crystallogr. A 24, 217 (1968).10.1107/S0567739468000306 ↗
22. Šmejkal, L., Sinova, J. & Jungwirth, T. Emerging research landscape of altermagnetism. Phys. Rev. X 12, 040501 (2022).
23. Naka, M., Motome, Y. & Seo, H. Anomalous Hall effect in antiferromagnetic perovskites. Phys. Rev. B 106, 195149 (2022).10.1103/PhysRevB.106.195149 ↗
24. Naka, M., Motome, Y. & Seo, H. Altermagnetic perovskites. npj Spintron. 3, 1 (2025).10.1038/s44306-024-00066-9 ↗
25. Chapman, B. J. et al. Large enhancement of emergent magnetic fields in MnSi with impurities and pressure. Phys. Rev. B 88, 214406 (2013).10.1103/PhysRevB.88.214406 ↗
26. Hamamoto, K., Ezawa, M. & Nagaosa, N. Quantized topological Hall effect in skyrmion crystal. Phys. Rev. B 92, 115417 (2015).10.1103/PhysRevB.92.115417 ↗
27. Thiel, S. et al. Tunable quasi-two-dimensional electron gases in oxide heterostructures. Science 313, 1942 (2006).10.1126/science.1131091 ↗
28. Liu, Z. Q. et al. Origin of the two-dimensional electron gas at LaAlO3/SrTiO3 interfaces: the role of oxygen vacancies and electronic reconstruction. Phys. Rev. X 3, 021010 (2013).
29. Delugas, P. et al. Spontaneous 2-dimensional carrier confinement at the n-type SrTiO3/LaAlO3 interface. Phys. Rev. Lett. 106, 166807 (2011).10.1103/PhysRevLett.106.166807 ↗
30. Zhong, Z., Tóth, A. & Held, K. Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces. Phys. Rev. B 87, 161102 (2013).10.1103/PhysRevB.87.161102 ↗
31. Singh, G. et al. Stoichiometric control of electron mobility and 2D superconductivity at LaAlO3-SrTiO3 interfaces. Commun. Phys. 7, 149 (2024).10.1038/s42005-024-01644-3 ↗
32. Joshua, A. et al. A universal critical density underlying the physics of electrons at the LaAlO3/SrTiO3 interface. Nat. Commun. 3, 1129 (2012).10.1038/ncomms2116 ↗
33. Huijben, M. et al. Defect engineering in oxide heterostructures by enhanced oxygen surface exchange. Adv. Funct. Mater. 23, 5240 (2013).10.1002/adfm.201203355 ↗
34. Zhao, Z. Y. et al. Ground state and magnetic phase transitions of orthoferrite DyFeO3. Phys. Rev. B 89, 224405 (2014).10.1103/PhysRevB.89.224405 ↗
35. Farajollahpour, T. et al. Berry curvature-induced transport signature for altermagnetic order. npj Quantum Mater. 10, 77 (2025).10.1038/s41535-025-00805-z ↗
36. Momma, K. & Izumi, F. VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data. J. Appl. Cryst. 44, 1272 (2011).10.1107/S0021889811038970 ↗