Non-adiabatic spin torque investigated using thermally activated magnetic domain wall dynamics

Abstract

Using transmission electron microscopy, we investigate the thermally activated motion of domain walls (DWs) between two positions in permalloy (Ni80Fe20) nanowires at room temperature. We show that this purely thermal motion is well described by an Arrhenius law, allowing for a description of the DW as a quasi-particle in a 1D potential landscape. By injecting small currents, the potential is modified, allowing for the determination of the non-adiabatic spin torque: the non-adiabatic coefficient is 0.010 +/- 0.004 for a transverse DW and 0.073 +/- 0.026 for a vortex DW. The larger value is attributed to the higher magnetization gradients present.

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• Very low critical current density for motion of coupled domain walls in synthetic ferrimagnet nanowires
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• Enhanced Non-Adiabaticity in Vortex Cores due to the Emergent Hall Effect
• Influence of material defects on current-driven vortex domain wall mobility
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• Spin Hall Effect-driven Spin Torque in Magnetic Texture
• Numerical Computation of Spin-Transfer Torques for Antiferromagnetic Domain walls
• Numerical analysis of the Landau--Lifshitz--Bloch equation with spin-torques