[8p-N304-1~9] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

3:15 PM - 3:30 PM JST(6:15 AM - 6:30 AM UTC)English Presentation

[8p-N304-7] Electric-field control of magnetic signatures in ferromagnetic Rashba 2DEGs

〇Bibes Manuel¹ (1.Lab. Albert Fert)

Keywords:

oxide 2DEGs,Rashba spin-orbit coupling

The broken inversion symmetry at interfaces of complex oxides gives rise to emergent phenomena, including ferromagnetism and Rashba spin-orbit coupling (SOC), which profoundly influence the electronic structure by entangling spin and momentum. While the interplay between Rashba SOC and ferromagnetism is theoretically intriguing, its experimental manifestations remain largely unexplored. In this talk, we will demonstrate that ferromagnetic 2DEGs at SrTiO₃-based interfaces exhibit spontaneous nonreciprocal transport – a distinctive hallmark of Rashba ferromagnets – even in the absence of an external magnetic field. This nonreciprocal response, along with clear signatures of ferromagnetism such as anisotropic magnetoresistance and the anomalous Hall effect (AHE), is strongly tunable by gate voltage. Remarkably, the AHE not only varies in amplitude but even reverses sign, reflecting a subtle interplay between Fermi level position and Berry curvature distribution. These results establish SrTiO₃ 2DEGs as a model platform for studying Rashba ferromagnetism and demonstrate active control over transport phenomena in time- and inversion-symmetry-broken systems, paving the way for gate-tunable spintronic devices.