Dynamic detection of current-induced spin-orbit magnetic fields: a phase independent approach

Abstract

Current induced spin-orbit torques (SOTs) in ferromagnet/non-magnetic metal heterostructures open vast possibilities to design spintronic devices to store, process and transmit information in a simple architecture. It is a central task to search for efficient SOT-devices, and to quantify the magnitude as well as the symmetry of current-induced spin-orbit magnetic fields (SOFs). Here, we report a novel approach to determine the SOFs based on magnetization dynamics by means of time-resolved magneto-optic Kerr microscopy. A microwave current in a narrow Fe/GaAs (001) stripe generates an Oersted field as well as SOFs due to the reduced symmetry at the Fe/GaAs interface, and excites standing spin wave (SSW) modes because of the lateral confinement. Due to their different symmetries, the SOFs and the Oersted field generate distinctly different mode patterns. Thus it is possible to determine the magnitude of the SOFs from an analysis of the shape of the SSW patterns. Specifically, this method, which is conceptually different from previous approaches based on lineshape analysis, is phase independent and self-calibrated. It can be used to measure the current induced SOFs in other material systems, e.g., ferromagnetic metal/non-magnetic metal heterostructures.

References in corpus (25)

• Spin torque switching with the giant spin Hall effect of tantalum
• The design and verification of Mumax3
• Current-driven dynamics of chiral ferromagnetic domain walls
• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Spin Transfer Torque Generated by the Topological Insulator Bi_2Se_3
• Layer thickness dependence of the current induced effective field vector in Ta|CoFeB|MgO
• Control of spin-orbit torques through crystal symmetry in WTe2/ferromagnet bilayers
• Role of transparency of platinum-ferromagnet interface in determining intrinsic magnitude of spin Hall effect
• Dependence of the Efficiency of Spin Hall Torque on the Transparency of Pt-Ferromagnetic Layer Interfaces
• Fermi level dependent charge-to-spin current conversion by Dirac surface state of topological insulators
• Ultra-low magnetic damping of a metallic ferromagnet
• Magnetic oscillations driven by the spin Hall effect in 3-terminal magnetic tunnel junction devices
• Spin-orbit driven ferromagnetic resonance: A nanoscale magnetic characterisation technique
• On the line shape of the electrically detected ferromagnetic resonance
• Electrical manipulation of a ferromagnet by an antiferromagnet
• On the origin of field-like spin-orbit torques in heavy metal-ferromagnet-oxide thin film heterostructures
• Spin-orbit torques in NbSe${}_2$/Permalloy bilayers
• Snell's Law for Spin Waves
• Strong Spin Hall Effect in the Antiferromagnet PtMn
• Damping-like Torque in Monolayer 1T-TaS${}_2$
• Current-Induced Torques with Dresselhaus Symmetry Due to Resistance Anisotropy in 2D Materials
• Magnetic control of spin-orbit fields: a first-principles study of Fe/GaAs junctions
• Topological Surface States Originated Spin-Orbit Torques in Bi2Se3
• Ferromagnetic resonance phase imaging in spin Hall multilayers