Optical detection of spin orbit torque and current induced heating

Abstract

We have studied spin orbit torque in heavy metal (HM)/ferromagnetic metal (FM) bilayers using magneto-optical Kerr effect. A double modulation technique is developed to separate signals from spin orbit torque and Joule heating. At a current density of ~1x10${}^{10}$ A/m${}^2$, we observe optical signals that scale linearly and quadratically with the current density, both in similar magnitude. The spin orbit torque estimated using this technique is consistent with that evaluated using spin transport measurements. We find that changes in the refractive index of the film with temperature is the main source of the heating induced signal.

References in corpus (18)

• Spin torque switching with the giant spin Hall effect of tantalum
• New Perspectives for Rashba Spin-Orbit Coupling
• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• Symmetry and magnitude of spin-orbit torques in ferromagnetic heterostructures
• Spin Hall Magnetoresistance Induced by a Non-Equilibrium Proximity Effect
• Layer thickness dependence of the current induced effective field vector in Ta|CoFeB|MgO
• Theory of spin Hall magnetoresistance
• Anatomy of Spin-Transfer Torque
• 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
• 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 Hall magnetoresistance in metallic bilayers
• Magneto-Optical Detection of the Spin Hall Effect in Pt and W Thin Films
• All-Optical Vector Measurement of Spin-Orbit-Induced Torques Using Both Polar and Quadratic Magneto-Optic Kerr Effects
• Interference induced enhancement of magneto-optical Kerr effect in ultrathin magnetic films
• Accurate analysis for harmonic Hall voltage measurement for spin-orbit torques

Cited by in corpus (3)

• Observation of the orbital Hall effect in a light metal Ti
• Simultaneous Optical and Electrical Spin-Torque Magnetometry with Stroboscopic Detection of Spin-Precession Phase
• Polar and quadratic magneto-optical Kerr effects in nonmagnetic/ferromagnet bilayers for spin-orbit torque measurements