Interaction of Magnetization and Heat Dynamics for Pulsed Domain Wall Movement with Joule Heating

Abstract

Pulsed domain wall movement is studied here in Ni80Fe20 nanowires on SiO2, using a fully integrated electrostatic, thermoelectric, and micromagnetics solver based on the Landau-Lifshitz-Bloch equation, including Joule heating, anisotropic magneto-resistance, and Oersted field contributions. During the applied pulse the anisotropic magneto-resistance of the domain wall generates a dynamic heat gradient which increases the current-driven velocity by up to 15%. Using a temperature-dependent conductivity significant differences are found between the constant voltage-pulsed and constant current-pulsed domain wall movement: constant voltage pulses are shown to be more efficient at displacing domain walls whilst minimizing the increase in temperature, with the total domain wall displacement achieved over a fixed pulse duration having a maximum with respect to the driving pulse strength.

Corrected from previous 25 Jun 2016 version, due to error found in a computational routine

References in corpus (3)

• Influence of Joule heating on current-induced domain wall depinning
• Effective Field Model of Roughness in Magnetic Structures
• Thermal spin injection and interface insensitivity in permalloy/aluminum metallic non-local spin valves

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