Nonreciprocal Transport in Interfacial Rashba Ferromagnets

Interfacial systems displaying a Rashba spin-orbit coupling (SOC) may be used to realize spin-charge interconversion with great efficiency (through the direct and inverse Edelstein effects), and as such be used as sources and detectors of spin currents¹. Because of their broken inversion symmetry, they also display nonreciprocal transport phenomena², such as unidirectional magnetoresistance. While the Rashba SOC is a universal feature of surfaces and heterointerfaces, transition metal oxides also often display unexpected magnetic properties at their surfaces and interfaces³. However, the interesting interplay that may arise between the Rashba-type SOI and surface or interfacial ferromagnetism, that would then qualify the system as a Rashba ferromagnet⁴, has been little investigated. In this talk, we will explore the possibility to endow Rashba systems with a magnetic order and explore the consequence of the interplay between these two phenomena. In particular, we will discuss how magnetism can strongly enhance the spin-charge interconversion efficiency⁵ and yield spontaneous non-reciprocal transport, in the absence of external magnetic field.<br/>1. Trier, F. <i>et al.</i> <b>Nat Rev Mater</b> 7, 258 (2022).<br/>2. Tokura, Y. <i>et al.</i> <b>Nat Commun</b> 9, 3740 (2018).<br/>3. Bhattacharya, A. <i>et al.</i> <b>Annu. Rev. Mater. Res.</b> 44, 65 (2014).<br/>4. Ado, I. A. <i>et al.</i> <b>Phys. Rev. Lett.</b> 121, 086802 (2018).<br/>5. Lazrak, G. <i>et al.</i> <b>Phys. Rev. Res.</b> 6, 023074 (2024).