Lee, J.H.; Harada, T.; Trier, F.; Marcano, L.; Godel, F.; Valencia, S.; Tsukazaki, A.; Bibes, M.: Nonreciprocal Transport in a Rashba Ferromagnet, Delafossite PdCoO2. Nano Letters 21 (2021), p. 8687-8692
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Rashba interfaces yield efficient spin-charge interconversion and give rise to nonreciprocal transport phenomena. Here, we report magnetotransport experiments in few-nanometer-thick films of PdCoO2, a delafossite oxide known to display a large Rashba splitting and surface ferromagnetism. By analyzing the angle dependence of the first- and second-harmonic longitudinal and transverse resistivities, we identify a Rashba-driven unidirectional magnetoresistance that competes with the anomalous Nernst effect below the Curie point. We estimate a Rashba coefficient of 0.75 ± 0.3 eV Å and argue that our results qualify delafossites as a new family of oxides for nanospintronics and spin–orbitronics, beyond perovskite materials.