Spin caloric effects in antiferromagnets assisted by an external spin current

Abstract

Searching for novel spin caloric effects in antiferromagnets we study the properties of thermally activated magnons in the presence of an external spin current and temperature gradient. We predict the spin Peltier effect -- generation of a heat flux by spin accumulation -- in an antiferromagnetic insulator with cubic or uniaxial magnetic symmetry. This effect is related with spin-current induced splitting of the relaxation times of the magnons with opposite spin direction. We show that the Peltier effect can trigger antiferromagnetic domain wall motion with a force whose value grows with the temperature of a sample. At a temperature, larger than the energy of the low-frequency magnons, this force is much larger than the force caused by direct spin transfer between the spin current and the domain wall. We also demonstrate that the external spin current can induce the magnon spin Seebeck effect. The corresponding Seebeck coefficient is controlled by the current density. These spin-current assisted caloric effects open new ways for the manipulation of the magnetic states in antiferromagnets.

SUbmitted to J.Phus. D as a part of special issue on Spin Caloritronics

References in corpus (6)

• Spin pumping and spin-transfer torques in antiferromagnets
• Spin Hall magnetoresistance in antiferromagnet/heavy-metal heterostructures
• Thermal imaging of spin Peltier effect
• Electrical Detection of Spin Backflow from an Antiferromagnetic Insulator/Y3Fe5O12 Interface
• Spin Currents and Magnon Dynamics in Insulating Magnets
• Thermally induced magnon accumulation in two-sublattice magnets

Cited by in corpus (8)

• Long-distance spin-transport across the Morin phase transition up to room temperature in ultra-low damping single crystals of the antiferromagnet α-Fe2O3
• Propagation length of antiferromagnetic magnons governed by domain configurations
• Micromagnetic modeling of Terahertz oscillations in an antiferromagnetic material driven by spin-Hall effect
• Structure, control, and dynamics of altermagnetic textures
• Rectification of the spin Seebeck current in noncollinear antiferromagnets
• Giant localised spin-Peltier effect due to ultrafast domainwalls motion in antiferromagnetic metals
• Coupling of ferromagnetic and antiferromagnetic spin dynamics in Mn${}_2$Au/NiFe thin-film bilayers
• Thermally induced spin torque and domain wall motion in superconductor/antiferromagnetic insulator bilayers