Detection of long-range orbital-Hall torques
Arnab Bose, Fabian Kammerbauer, Rahul Gupta, Dongwook Go, Yuriy Mokrousov, G. Jakob, Mathias Kläui
Abstract
We report and quantify a large orbital-Hall torque generated by Nb and Ru, which we identify from the strong dependence of torques on the ferromagnets. This is manifested as strong enhancement in the dampinglike torques measured in Nb (or Ru)/Ni bilayers as compared to Nb (or Ru)/FeCoB bilayers including the sign reversal in the case of Nb/(Ni or FeCoB) samples. We experimentally observe a striking enhancement of the measured torques with the increase of ferromagnetic Ni thickness which is markedly different from the regular spin-transfer torque; this could be a unique signature of long-range action of the orbital-Hall torques.
Topics & Concepts
TorqueFerromagnetismCondensed matter physicsHall effectSpin-transfer torqueSpin (aerodynamics)Sign (mathematics)Materials scienceRange (aeronautics)PhysicsMagnetizationElectrical resistivity and conductivityMagnetic fieldThermodynamicsQuantum mechanicsMathematical analysisComposite materialMathematicsMagnetic properties of thin filmsPhysics of Superconductivity and MagnetismQuantum and electron transport phenomena