Energy and magnetization transport in nonequilibrium macrospin systems.
We investigate numerically the magnetization dynamics of an array of nanodisks interacting through the magnetodipolar coupling. In the presence of a temperature gradient, the chain reaches a nonequilibrium steady state where energy and magnetization currents propagate. This effect can be described as the flow of energy and particle currents in an off-equilibrium discrete nonlinear Schrödinger (DNLS) equation. This model makes transparent the transport properties of the system and allows for a precise definition of temperature and chemical potential for a precessing spin. The present study proposes a setup for the spin-Seebeck effect, and shows that its qualitative features can be captured by a general oscillator-chain model.
Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.|Department of Materials and Nanophysics, School of Information and Communication Technology, Electrum 229, Royal Institute of Technology, SE-16440 Kista, Sweden.
Simone
S
Borlenghi
Centre de Biophysique Moléculaire (CBM), CNRS-UPR 4301 Rue Charles Sadron, F-45071 Orléans, France.
Stefano
S
Iubini
Consiglio Nazionale delle Ricerche, Istituto dei Sistemi Complessi, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy.|Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, via G. Sansone 1, I-50019 Sesto Fiorentino, Italy.
Stefano
S
Lepri
Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
Jonathan
J
Chico
Department of Materials and Nanophysics, School of Information and Communication Technology, Electrum 229, Royal Institute of Technology, SE-16440 Kista, Sweden.
Lars
L
Bergqvist
Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.|Department of Materials and Nanophysics, School of Information and Communication Technology, Electrum 229, Royal Institute of Technology, SE-16440 Kista, Sweden.
Anna
A
Delin
Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
Jonas
J
Fransson
D060328:Magnetic Phenomena; D008962:Models, Theoretical; D009038:Motion; D010507:Periodicity; D013696:Temperature