Energy and magnetization transport in nonequilibrium macrospin systems

Area of Science:

• Condensed Matter Physics
• Spintronics
• Statistical Mechanics

Background:

• Magnetization dynamics in nanostructured materials are crucial for data storage and spintronic devices.
• Understanding transport phenomena in magnetic systems under thermal gradients is key to novel functionalities.

Purpose of the Study:

• To numerically investigate magnetization dynamics in interacting nanodisks under a temperature gradient.
• To model the emergent energy and magnetization currents using a discrete nonlinear Schrödinger (DNLS) equation.
• To explore the applicability of this model to the spin-Seebeck effect.

Main Methods:

• Numerical simulations of magnetization dynamics in an array of nanodisks.
• Analysis of magnetodipolar coupling effects.
• Development and application of a discrete nonlinear Schrödinger (DNLS) equation model.

Main Results:

• The system reaches a nonequilibrium steady state with propagating energy and magnetization currents.
• The DNLS equation effectively describes the transport properties and allows for defining temperature and chemical potential for precessing spins.
• The study proposes a setup for the spin-Seebeck effect.

Conclusions:

• The proposed model captures the qualitative features of the spin-Seebeck effect in interacting nanodisks.
• The DNLS equation provides a transparent framework for understanding transport in such systems.
• This work offers a pathway for designing novel spintronic devices based on thermal gradients.