Longitudinal optical and spin-Hall conductivities of Rashba conducting strips coupled to ferro- and antiferromagnetic layers
arXiv:1610.09399 · doi:10.1103/PhysRevB.95.045146
Abstract
A system composed of a conducting planar strip with Rashba spin-orbit coupling (RSOC), magnetically coupled to a layer of localized magnetic moments, at equilibrium, is studied within a microscopic Hamiltonian with numerical techniques at zero temperature in the clean limit. In particular, transport properties for the cases of ferromagnetic (FM) and antiferromagnetic (AFM) coupled layers are computed in linear response on strips of varying width. Some behaviors observed for these properties are consistent with the ones observed for the corresponding Rashba helical currents. The case of uncoupled Rashba strips is also studied for comparison. In the case of Rashba strips coupled to an AFM localized order, results for the longitudinal dc conductivity, for small strip widths, suggest the proximity to a metal-insulator transition. More interesting, in the proximity of this transition, and in general at intermediate values of the RSOC, it is observed a large spin-Hall conductivity that is two orders of magnitude larger than the one for the FM order for the same values of the RSOC and strip widths. There are clearly two different regimes for small and for large RSOC, which is also present in the behavior of Rashba helical currents. Different contributions to the optical and the spin-Hall conductivities, according to a new classification of inter- or intra-band origin proposed for planar strips in the clean limit, or coming from the hopping or spin-orbit terms of the Hamiltonian, are examined. Finally, the effects of different orientation of the coupled magnetic moments will be also studied.
arXiv comment12 pages, 13 figures, to be published in Physical Review B
References in corpus (22)
- Spintronics: Fundamentals and applications
- Universal Intrinsic Spin-Hall Effect
- Electrical switching of an antiferromagnet
- Relativistic Neel-order fields induced by electrical current in antiferromagnets
- On A Proper Definition of Spin Current
- Staggering antiferromagnetic domain wall velocity in a staggered spin-orbit field
- Diffusive spin dynamics in ferromagnetic thin films with a Rashba interaction
- Quantum transport in Rashba spin-orbit materials: A review
- Spin-orbit torques in Co/Pt(111) and Mn/W(001) magnetic bilayers from first principles
- Chirality from interfacial spin-orbit coupling effects in magnetic bilayers
- Ferromagnetic exchange, spin-orbit coupling and spiral magnetism at the LaAlO_3/SrTiO_3 interface
- Quantum Kinetic Theory of Current-Induced Torques in Rashba Ferromagnets
- Sum rules for spin-Hall conductivity cancelation
- Intraband and interband spin-orbit torques in non-centrosymmetric ferromagnets
- Robust Picosecond writing of a Layered Antiferromagnet by Staggered Spin-Orbit-Fields
- Intrinsic instability of electronic interfaces with strong Rashba coupling
- The Intrinsic Spin Hall Conductivity in a Generalized Rashba Model
- Theory of light-induced effective magnetic field in Rashba ferromagnets
- Spin polarization in the Hubbard model with Rashba spin-orbit coupling on a ladder
- Magnetic and transport signatures of Rashba spin-orbit coupling on the ferromagnetic Kondo lattice model in two dimensions
- Possible mechanisms of electronic phase separation in oxide interfaces
- Helical currents in metallic Rashba strips