Field-like spin orbit torque in ultra-thin polycrystalline FeMn films

Abstract

Field-like spin orbit torque in FeMn/Pt bilayers with ultra-thin polycrystalline FeMn has been characterized through planar Hall effect measurements. A large effective field is obtained for FeMn in the thickness range of 2 to 5 nm. The experimental observations can be reasonably accounted for by using a macro-spin model under the assumption that the FeMn layer is composed of two spin sublattices with unequal magnetizations. The large effective field corroborates the spin Hall origin of the effective field considering the much smaller uncompensated net moments in FeMn as compared to NiFe. The effective absorption of spin current by FeMn is further confirmed by the fact that spin current generated by Pt in NiFe/FeMn/Pt trilayers can only travel through the FeMn layer with a thickness of 1 to 4 nm. By quantifying the field-like effective field induced in NiFe, a spin diffusion length of 2 nm is estimated in FeMn, in consistence with values reported in literature by ferromagnetic resonance and spin-pumping experiments.

arXiv comment37 pages, 12 figures

References in corpus (29)

• Spin torque switching with the giant spin Hall effect of tantalum
• Magnetic switching by spin torque from the spin Hall effect
• 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
• Spin-Diffusion Lengths in Metals and Alloys, and Spin-Flipping at Metal/Metal Interfaces: an Experimentalist's Critical Review
• Evidence for reversible control of magnetization in a ferromagnetic material via spin-orbit magnetic field
• Relativistic Neel-order fields induced by electrical current in antiferromagnets
• Dependence of the Efficiency of Spin Hall Torque on the Transparency of Pt-Ferromagnetic Layer Interfaces
• Antiferromagnonic Spin Transport from Y${}_3$Fe${}_5$O${}_{12}$ into NiO
• Intrinsic Spin Seebeck Effect in Au/YIG
• Fieldlike and antidamping spin-orbit torques in as-grown and annealed Ta/CoFeB/MgO layers
• Comparison of spin-orbit torques and spin pumping across NiFe/Pt and NiFe/Cu/Pt interfaces
• Spin transfer in an antiferromagnet
• Conduction of spin currents through insulating oxides
• Spin-orbit torques in Co/Pd multilayer nanowires
• Correlation between the spin Hall angle and the structural phases of early 5d transition metals
• Anti-damping spin transfer torque through epitaxial Nickel oxide
• Spin-transfer torques in anti-ferromagnetic metals from first principles
• Spin Transport in Antiferromagnetic Insulators Mediated by Magnetic Correlations
• Effect of Polarized Current on the Magnetic State of Antiferromagnet
• Anomalous temperature dependence of current induced torques in CoFeB|MgO heterostructures with Ta based underlayers
• Ab-initio GMR and current-induced torques in Au/Cr multilayers
• Spin Transfer Torque in Antiferromagnetic Spin-Valves: From Clean to Disordered Regimes
• Inelastic scattering in ferromagnetic and antiferromagnetic metal spintronics
• A Study of Spin-Flipping in Sputtered IrMn using Py-based Exchange-Biased Spin-Valves
• Spin-transfer-torque through antiferromagnetic IrMn

Cited by in corpus (9)

• Antiferromagnetic spintronics
• FMR-related phenomena in spintronic devices
• Spin Transport through the metallic antiferromagnet FeMn
• Generation of pure superconducting spin current in magnetic heterostructures via non-locally induced magnetism due to Landau Fermi-liquid effects
• Spin Hall magnetoresistance in antiferromagnet/normal metal bilayers
• Self-current induced spin-orbit torque in FeMn/Pt multilayers
• Macro-spin Modeling and Experimental Study of Spin-orbit Torque Biased Magnetic Sensors
• Semitransparent anisotropic and spin Hall magnetoresistance sensor enabled by spin-orbit toque biasing
• Static and Dynamic Magnetic Properties of FeMn/Pt Multilayers