Deficiency of the Bulk Spin Hall Effect Model for Spin-Orbit Torques in Magnetic Insulator/Heavy Metal Heterostructures
arXiv:1705.08919 · doi:10.1103/PhysRevB.95.241305
Abstract
Electrical currents in a magnetic insulator/heavy metal heterostructure can induce two simultaneous effects, namely, spin Hall magnetoresistance (SMR) on the heavy metal side and spin-orbit torques (SOTs) on the magnetic insulator side. Within the framework of the pure spin current model based on the bulk spin Hall effect (SHE), the ratio of the spin Hall-induced anomalous Hall effect (SH-AHE) to SMR should be equal to the ratio of the field-like torque (FLT) to damping-like torque (DLT). We perform a quantitative study of SMR, SH-AHE, and SOTs in a series of thulium iron garnet/platinum or Tm3Fe5O12/Pt heterostructures with different Tm3Fe5O12 thicknesses, where Tm3Fe5O12 is a ferrimagnetic insulator with perpendicular magnetic anisotropy. We find the ratio between measured effective fields of FLT and DLT is at least 2 times larger than the ratio of the SH-AHE to SMR. In addition, the bulk SHE model grossly underestimates the spin torque efficiency of FLT. Our results reveal deficiencies of the bulk SHE model and also address the importance of interfacial effects such as the Rashba and magnetic proximity effects in magnetic insulator/heavy metal heterostructures.
References in corpus (32)
- Spin torque switching with the giant spin Hall effect of tantalum
- Spin Hall effect
- Magnetic switching by spin torque from the spin Hall effect
- Current-driven dynamics of chiral ferromagnetic domain walls
- Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
- Nonlocal magnetization dynamics in ferromagnetic heterostructures
- Spin Seebeck insulator
- Symmetry and magnitude of spin-orbit torques in ferromagnetic heterostructures
- Spin Hall Magnetoresistance Induced by a Non-Equilibrium Proximity Effect
- Switching of perpendicular magnetization by spin-orbit torques in the absence of external magnetic fields
- Layer thickness dependence of the current induced effective field vector in Ta|CoFeB|MgO
- Theory of spin Hall magnetoresistance
- Quantitative characterization of the spin orbit torque using harmonic Hall voltage measurements
- Universal Scaling Behavior of Anomalous Hall Effect and Anomalous Nernst Effect in Itinerant Ferromagnets
- Role of transparency of platinum-ferromagnet interface in determining intrinsic magnitude of spin Hall effect
- Quantitative study of the spin Hall magnetoresistance in ferromagnetic insulator/normal metal hybrids
- Current induced torques and interfacial spin-orbit coupling: Semiclassical Modeling
- Dependence of the Efficiency of Spin Hall Torque on the Transparency of Pt-Ferromagnetic Layer Interfaces
- Spin torque study of the spin Hall conductivity and spin diffusion length in platinum thin films with varying resistivity
- Finite-element theory of transport in ferromagnet-normal metal systems
- Interplay of spin-orbit torque and thermoelectric effects in ferromagnet/normal metal bilayers
- Interface control of the magnetic chirality in CoFeB|MgO heterosctructures with heavy metal underlayers
- Spin-orbit torque engineering via oxygen manipulation
- Electric-field control of spin-orbit torque in a magnetically doped topological insulator
- Spin-transport in multi-terminal normal metal - ferromagnet systems with non-collinear magnetizations
- Angular and temperature dependence of current induced spin-orbit effective fields in Ta/CoFeB/MgO nanowires
- Current-induced domain wall motion in Rashba spin-orbit system
- Anomalous Hall hysteresis in Tm3Fe5O12/Pt with strain-induced perpendicular magnetic anisotropy
- Theory of spin Hall magnetoresistance (SMR) and related phenomena
- Large spin-wave bullet in a ferrimagnetic insulator driven by spin Hall effect
- Current-induced spin torque resonance of magnetic insulators
- Current-induced spin torque resonance of a magnetic insulator
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- Role of dimensional crossover on spin-orbit torque efficiency in magnetic insulator thin films
- Current-Induced Magnetization Control in Insulating Ferrimagnetic Garnets
- Spin-current-related magnetoresistance in epitaxial Pt/Co bilayers in the presence of spin Hall effect and Rashba-Edelstein effect
- Leveraging symmetry for an accurate spin-orbit torques characterization in ferrimagnetic insulators
- Current-induced CrI3 surface spin-flop transition probed by proximity magnetoresistance in Pt