title: Highly efficient and tunable spin-to-charge conversion through Rashba coupling at oxide interfaces.
abstract: The spin-orbit interaction couples the electrons' motion to their spin. As a result, a charge current running through a material with strong spin-orbit coupling generates a transverse spin current (spin Hall effect, SHE) and vice versa (inverse spin Hall effect, ISHE). The emergence of SHE and ISHE as charge-to-spin interconversion mechanisms offers a variety of novel spintronic functionalities and devices, some of which do not require any ferromagnetic material. However, the interconversion efficiency of SHE and ISHE (spin Hall angle) is a bulk property that rarely exceeds ten percent, and does not take advantage of interfacial and low-dimensional effects otherwise ubiquitous in spintronic hetero- and mesostructures. Here, we make use of an interface-driven spin-orbit coupling mechanism-the Rashba effect-in the oxide two-dimensional electron system (2DES) LaAlO3/SrTiO3to achieve spin-to-charge conversion with unprecedented efficiency. Through spin pumping, we inject a spin current from a NiFe film into the oxide 2DES and detect the resulting charge current, which can be strongly modulated by a gate voltage. We discuss the amplitude of the effect and its gate dependence on the basis of the electronic structure of the 2DES and highlight the importance of a long scattering time to achieve efficient spin-to-charge interconversion.
authors: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors: E
authors: E
authors: Lesne
authors: Spintec, Institut Nanosciences et Cryogenie, Univ. Grenoble Alpes, CEA, CNRS, F-38000 Grenoble, France.
authors: Yu
authors: Y
authors: Fu
authors: Spintec, Institut Nanosciences et Cryogenie, Univ. Grenoble Alpes, CEA, CNRS, F-38000 Grenoble, France.|Departamento de Física, CEDENNA, Universidad de Santiago de Chile (USACH), Avenida Ecuador 3493, 9170124 Santiago, Chile.
authors: S
authors: S
authors: Oyarzun
authors: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors: J C
authors: http://orcid.org/0000-0001-7044-2785
authors: JC
authors: Rojas-Sánchez
authors: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors: D C
authors: DC
authors: Vaz
authors: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.|Tohoku University, Department of Applied Physics, 6-6-05 Aoba, Aramaki, Aoba, Sendai 980-8579, Japan.
authors: H
authors: H
authors: Naganuma
authors: Institut Nanosciences et Cryogenie, Univ. Grenoble Alpes, CEA, F-38000 Grenoble, France.
authors: G
authors: G
authors: Sicoli
authors: Spintec, Institut Nanosciences et Cryogenie, Univ. Grenoble Alpes, CEA, CNRS, F-38000 Grenoble, France.
authors: J-P
authors: JP
authors: Attané
authors: Spintec, Institut Nanosciences et Cryogenie, Univ. Grenoble Alpes, CEA, CNRS, F-38000 Grenoble, France.
authors: M
authors: M
authors: Jamet
authors: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors: E
authors: E
authors: Jacquet
authors: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors: J-M
authors: JM
authors: George
authors: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors: A
authors: A
authors: Barthélémy
authors: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors: H
authors: H
authors: Jaffrès
authors: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors: A
authors: A
authors: Fert
authors: Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.
authors: M
authors: M
authors: Bibes
authors: Spintec, Institut Nanosciences et Cryogenie, Univ. Grenoble Alpes, CEA, CNRS, F-38000 Grenoble, France.
authors: L
authors: L
authors: Vila