Unveiling domain wall dynamics of ferrimagnets in thermal magnon currents: Competition of angular momentum transfer and entropic torque
Andreas Donges, Niklas Grimm, Florian Jakobs, Severin Selzer, Ulrike Ritzmann, Unai Atxitia, Ulrich Nowak
Abstract
When magnetic materials are subject to a temperature gradient, domain walls are known to move towards the hotter end of the system. This paper shows that in certain types of ferrimagnets, domain walls can move in either directions, towards the hotter or the cooler end, depending on temperature. This effect rests on a competition between maximization of entropy and an adiabatic transfer of magnonic angular momentum.
Topics & Concepts
MagnonPhysicsAngular momentumCondensed matter physicsAdiabatic processThermalEntropy (arrow of time)TorqueDomain (mathematical analysis)Dynamics (music)FerromagnetismThermal fluctuationsMagnetizationMomentum transferMagnetic domainSpin-transfer torqueMaximizationToroidClassical mechanicsDomain wall (magnetism)Spin (aerodynamics)Heat transferMagnetization dynamicsMomentum (technical analysis)Rotational dynamicsCompetition (biology)Spin waveVorticitySkyrmionInstabilityMagnetic properties of thin filmsMagnetic Properties of AlloysChemical and Physical Properties of Materials