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Unveiling Domain Wall Dynamics of Ferrimagnets in Thermal Magnon Currents: Competition of Angular Momentum Transfer and Entropic Torque by Donges, Andreas; Grimm, Niklas; Jakobs, Florian; Selzer, Severin; Ritzmann, Ulrike; Atxitia, Unai; Nowak, Ulrich is a scholarly article available to read on EtoBox.

What is Unveiling Domain Wall Dynamics of Ferrimagnets in Thermal Magnon Currents: Competition of Angular Momentum Transfer and Entropic Torque about?

Control of magnetic domain wall motion holds promise for efficient manipulation and transfer of magnetically stored information. Thermal magnon currents, generated by temperature gradients, can be used to move magnetic textures, from domain walls, to magnetic vortices and skyrmions. In the last years, theoretical studies have centered in ferro- and antiferromagnetic spin structures, where domain walls always move towards the hotter end of the thermal gradient. Here we perform numerical studies using atomistic spin dynamics simulations and complementary analytical calculations to derive an equation of motion for the domain wall velocity. We demonstrate that in ferrimagnets, domain wall motion under thermal magnon currents shows a much richer dynamics. Below the Walker breakdown, we find that the temperature gradient always pulls the domain wall towards the hot end by minimizating its free energy, in agreement with the observations for ferro- and antiferromagnets in the same regime. Above Walker breakdown, the ferrimagnetic domain wall can show the opposite, counterintuitive behavior of moving towards the cold end. We show that in this case, the motion to the hotter or the colder end

Author

Donges, Andreas; Grimm, Niklas; Jakobs, Florian; Selzer, Severin; Ritzmann, Ulrike; Atxitia, Unai; Nowak, Ulrich

Published

2019

Language

EN