Origins of the unidirectional spin Hall magnetoresistance in metallic bilayers

Abstract

Recent studies evidence the emergence of asymmetric electron transport in layered conductors owing to the interplay between electrical conductivity, magnetization, and the spin Hall or Rashba- Edelstein effects. Here, we investigate the unidirectional magnetoresistance (UMR) caused by the current-induced spin accumulation in Co/Pt and CoCr/Pt bilayers. We identify three competing mechanisms underpinning the resistance asymmetry, namely interface and bulk spin-dependent electron scattering and electron-magnon scattering. Our measurements provide a consistent description of the current, magnetic field, and temperature dependence of the UMR and show that both positive and negative UMR can be obtained by tuning the interface and bulk spin-dependent scattering terms relative to the magnon population.

References in corpus (28)

• Symmetry and magnitude of spin-orbit torques in ferromagnetic heterostructures
• Spin Hall Magnetoresistance Induced by a Non-Equilibrium Proximity Effect
• Long distance transport of magnon spin information in a magnetic insulator at room temperature
• Theory of spin Hall magnetoresistance
• Quantitative study of the spin Hall magnetoresistance in ferromagnetic insulator/normal metal hybrids
• Interplay of spin-orbit torque and thermoelectric effects in ferromagnet/normal metal bilayers
• Unidirectional spin Hall magnetoresistance in ferromagnet/normal metal bilayers
• Spin Hall magnetoresistance in metallic bilayers
• Spin Transport at Interfaces with Spin-Orbit Coupling: Phenomenology
• Generation of coherent spin-wave modes in Yttrium Iron Garnet microdiscs by spin-orbit torque
• Spin-Hall Magnetoresistance in Platinum on Yttrium Iron Garnet: Dependence on platinum thickness and in-plane/out-of-plane magnetization
• Large Unidirectional Magnetoresistance in a Magnetic Topological Insulator
• Hanle Magnetoresistance in Thin Metal Films with Strong Spin-Orbit Coupling
• Current-nonlinear Hall effect and spin-orbit torque magnetization switching in a magnetic topological insulator
• Rashba-Edelstein Magnetoresistance in Metallic Heterostructure
• Magnetoresistance due to edge spin accumulation
• Spin Hall magnetoresistance at Pt/CoFe2O4 interfaces and texture effects
• Theory of unidirectional spin Hall magnetoresistance in heavy-metal/ferromagnetic-metal bilayers
• Electrical detection of magnetization reversal without auxiliary magnets
• Magnetoresistance of heavy and light metal/ferromagnet bilayers
• Intrinsic magnetoresistance in metal films on ferromagnetic insulators
• Spin-orbit torque opposing the Oersted torque in ultrathin Co/Pt bilayers
• Anisotropic magnetoresistance driven by surface spin orbit scattering
• Exchange magnon induced resistance asymmetry in permalloy spin-Hall oscillators
• Evaluation of bulk-interface contributions to Edelstein magnetoresistance at metal/oxide interfaces
• Thickness dependence of unidirectional spin-Hall magnetoresistance in metallic bilayers
• Relation between unidirectional spin Hall magnetoresistance and spin current-driven magnon generation
• Origin of threshold current density for asymmetric magnetoresistance in Pt/Py bilayers

Cited by in corpus (44)

• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Quantum metric-induced nonlinear transport in a topological antiferromagnet
• Giant orbital Hall effect and orbital-to-spin conversion in 3d, 5d, and 4f metallic heterostructures
• Spin-Orbit Torque and Nernst Effect in Bi-Sb/Co Heterostructures
• Effects of transition-metal spacers on the spin-orbit torques, spin Hall magnetoresistance, and magnetic anisotropy of Pt/Co bilayers
• Giant unidirectional magnetoresistance in topological insulator -- ferromagnetic semiconductor heterostructures
• Unidirectional orbital magnetoresistance in light metal/ferromagnet bilayers
• Observation of nuclear-spin Seebeck effect
• Magnon contribution to unidirectional spin Hall magnetoresistance
• Unidirectional Magnetoresistance in Antiferromagnet/Heavy-metal bilayers
• Large and Robust Charge-to-Spin Conversion in Sputtered Conductive WTex with Disorder
• Large unidirectional spin Hall and Rashba-Edelstein magnetoresistance in topological insulator/magnetic insulator heterostructures
• Spin-Hall magnetoresistance in a low-dimensional magnetic insulator
• Paramagnetic spin Hall magnetoresistance
• Unidirectional Spin Hall Magnetoresistance in Antiferromagnetic Heterostructures
• Large anomalous unidirectional magnetoresistance in a single ferromagnetic layer
• Theory of bilinear magneto-electric resistance from topological-insulator surface states
• Quantum kinetic theory of quadratic responses
• Large Unidirectional Magnetoresistance in Metallic Heterostructures in the Spin Transfer Torque Regime
• Interface spin polarization of the Heusler compound Co2MnSi probed by unidirectional spin Hall magnetoresistance
• Spin anomalous-Hall unidirectional magnetoresistance
• Direct observation of current-induced nonlinear spin torque in Pt-Py bilayers
• Nonlinear longitudinal and transverse magnetoresistances due to current-induced magnon creation-annihilation processes
• Estimation of spin-orbit torques in the presence of current-induced magnon creation and annihilation
• Disentangle magnon magnetoresistance from anisotropic and spin Hall magnetoresistance in NiFe/Pt bilayers
• Nonlinear Seebeck effect in Ni${}_{81}$Fe${}_{19}$|Pt at room temperature
• The Role of Self-Torques in Transition Metal Dichalcogenide/Ferromagnet Bilayers
• Extrinsic spin Hall effect in inhomogeneous systems
• Quantum unidirectional magnetoresistance
• Non-reciprocal magnetoresistance, directional inhomogeneity and mixed symmetry Hall devices
• Frequency-dependent Phonon-mediated Unidirectional Magnetoresistance in a Metal on an Insulator with Highly Nonequilibrium Magnons
• Bilinear magnetoresistance in topological insulators: role of magnetic disorder
• Evidence of orbital Hall current induced correlation in second harmonic response of longitudinal and transverse voltage in light metal-ferromagnet bilayers
• Magnon-mediated electric current drag and nonlocal spin-Peltier effect in the ac regime
• Theory of nonlinear magnetoelectric transport effects in normal-metal $-$ magnetic-insulator heterostructures
• Anatomy of Type-X Spin-Orbit Torque Switching
• Roles of Electron-Magnon Cross Diffusion in Unidirectional Magnetoresistance of Metallic Magnetic Bilayers
• Theory of unidirectional magnetoresistance and nonlinear Hall effect
• Unidirectional magnetoresistance and spin-orbit torque in NiMnSb
• Spin-Orbit Torque in a Single Ferromagnetic Layer with Large Spin-Orbit Coupling
• Unidirectional spin Hall magnetoresistance and spin-orbit torques in HM${}_1$/Co/HM${}_2$ trilayer systems
• Asymmetric magnetoresistance in 3$d$-5$d$ based La${}_{0.67}$Ca${}_{0.33}$MnO${}_3$/SrIrO${}_3$ bilayer: The role of unidirectional anisotropy
• Spin Hall Magnetoresistance in Metallic Bilayers with In-plane Magnetized Ferromagnets
• Alternating Spintronics: Capacitive Behavior of Spin Valves and Resonator Applications