Antiferromagnetic magnon pseudospin: Dynamics and diffusive transport

Abstract

We formulate a theoretical description of antiferromagnetic magnons and their transport in terms of an associated pseudospin. The need and strength of this formulation emerges from the antiferromagnetic eigenmodes being formed from superpositions of spin-up and -down magnons, depending on the material anisotropies. Consequently, a description analogous to that of spin-1/2 electrons is demonstrated while accounting for the bosonic nature of the antiferromagnetic eigenmodes. Introducing the concepts of a pseudospin chemical potential together with a pseudofield and relating magnon spin to pseudospin allows a consistent description of diffusive spin transport in antiferromagnetic insulators with any given anisotropies and interactions. Employing the formalism developed, we elucidate the general features of recent non-local spin transport experiments in antiferromagnetic insulators hosting magnons with different polarisations. The pseudospin formalism developed herein is valid for any pair of coupled bosons and is likely to be useful in other systems comprising interacting bosonic modes.

to appear in Physical Review B

References in corpus (37)

• Topological Insulators
• Cavity Optomechanics
• Spin Hall effect
• Antiferromagnetic spintronics
• Spin Caloritronics
• Direct electronic measurement of the spin Hall effect
• Spin Seebeck insulator
• High cooperativity in coupled microwave resonator ferrimagnetic insulator hybrids
• Long distance transport of magnon spin information in a magnetic insulator at room temperature
• Semiconductor Spintronics
• Observation of the Magnon Hall Effect
• Electrically controlled long-distance spin transport through an antiferromagnetic insulator
• Spin dynamics in semiconductors
• Magnon spin transport driven by the magnon chemical potential in a magnetic insulator
• Gigahertz frequency antiferromagnetic resonance and strong magnon-magnon coupling in the layered crystal CrCl3
• Coupled Spin-Light dynamics in Cavity Optomagnonics
• Magnon Mediated Electric Current Drag Across a Ferromagnetic Insulator Layer
• Exchange-enhanced Ultrastrong Magnon-Magnon Coupling in a Compensated Ferrimagnet
• Spin Seebeck effect in antiferromagnets and compensated ferrimagnets
• Observation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers
• Antiferromagnetic Spin Wave Field-Effect Transistor
• Antiferromagnetic magnons as highly squeezed Fock states underlying quantum correlations
• Temperature dependence of the magnon spin diffusion length and magnon spin conductivity in the magnetic insulator yttrium iron garnet
• Magnon based logic in a multi-terminal YIG/Pt nanostructure
• Thermal Hall effect and topological edge states in a square lattice antiferromagnet
• Two-Fluid Theory for Spin Superfluidity in Magnetic Insulators
• Propagation length of antiferromagnetic magnons governed by domain configurations
• Spin transport in a magnetic insulator with zero effective damping
• Noninteger-spin magnonic excitations in untextured magnets
• Spin Currents and Magnon Dynamics in Insulating Magnets
• Nonabelian magnonics in antiferromagnets
• Nonlocal magnon spin transport in NiFe${}_2$O${}_4$ thin films
• Pure spin currents in magnetically ordered insulator/normal metal heterostructures
• Designing Rashba-Dresselhaus effect in magnetic insulators
• Spin Transport in Thick Insulating Antiferromagnetic Films
• Dipolar spin waves in uniaxial easy-axis antiferromagnets: A natural topological nodal-line semimetal
• Chemical potential of an antiferromagnetic magnon gas

Cited by in corpus (15)

• Observation of Antiferromagnetic Magnon Pseudospin Dynamics and the Hanle effect
• Observation of nonreciprocal magnon Hanle effect
• Exceptional sign changes of the non-local spin Seebeck effect in antiferromagnetic hematite
• Impact of gigahertz and terahertz transport regimes on spin propagation and conversion in the antiferromagnet IrMn
• All-electrical Magnon Transport Experiments in Magnetically Ordered Insulators
• Role of NiO in the nonlocal spin transport through thin NiO films on Y${}_3$Fe${}_5$O${}_{12}$
• Micromagnetic study of spin transport in easy-plane antiferromagnetic insulators
• Atomic-Scale Spin-Wave Polarizer Based on a Sharp Antiferromagnetic Domain Wall
• Magnon spin transport around the compensation magnetic field in easy-plane antiferromagnetic insulators
• Impact of magnetic anisotropy on the magnon Hanle effect in $\alpha$-Fe${}_2$O${}_3$
• Influence of low-energy magnons on magnon Hanle experiments in easy-plane antiferromagnets
• Nonreciprocal Magnon Hanle Effect in Antiferromagnetic $\alpha$-Fe${}_2$O${}_3$
• Observation of Dyakonov-Perel-type magnon spin relaxation in uniaxial antiferromagnetic insulators
• Squeezing and quantum control of antiferromagnetic magnon pseudospin
• Theory of drift-enabled control in nonlocal magnon transport