Magnonic Analogue of Edelstein Effect in Antiferromagnetic Insulators

Abstract

We investigate the nonequilibrium spin polarization due to a temperature gradient in antiferromagnetic insulators, which is the magnonic analogue of the inverse spin-galvanic effect of electrons. We derive a linear response theory of a temperature-gradient-induced spin polarization for collinear and noncollinear antiferromagnets, which comprises both extrinsic and intrinsic contributions. We apply our theory to several noncentrosymmetric antiferromagnetic insulators, i.e., to a one-dimensional antiferromagnetic spin chain, a single layer of kagome noncollinear antiferromagnet, e.g., ${\text{KFe}}_3(\text{OH}{)}_6({\text{SO}}_4{)}_2$, and a noncollinear breathing pyrochlore antiferromagnet, e.g., LiGaCr${}_4$O${}_8$. The shapes of our numerically evaluated response tensors agree with those implied by the magnetic symmetry. Assuming a realistic temperature gradient of $10\text{K}/\text{mm}$, we find two-dimensional spin densities of up to $\sim 10^6\hslash /{\text{cm}}^2$ and three-dimensional bulk spin densities of up to $\sim 10^{14}\hslash /{\text{cm}}^3$, encouraging an experimental detection.

17 pages,6 figures

References in corpus (20)

• Observation of the Magnon Hall Effect
• Theoretical prediction of rotating magnon wavepacket in ferromagnets
• Quantum Theory of Orbital Magnetization and its Generalization to Interacting Systems
• Spontaneous Magnon Decays
• Current-Induced Polarization and the Spin Hall Effect at Room Temperature
• Magnon Polarons in the Spin Seebeck Effect
• Thermal spin dynamics of yttrium iron garnet
• Spin waves in the Frustrated Kagome Lattice Antiferromagnet KFe3(OH)6(SO4)2
• Magnonic topological insulators in antiferromagnets
• Magnon-phonon interactions in magnetic insulators
• Signature of magnon Nernst effect in an antiferromagnetic insulator
• Topological Thermal Hall Effect in Frustrated Kagomé Antiferromagnets
• Anisotropic current-induced spin accumulation in the two-dimensional electron gas with spin-orbit coupling
• Quantum Selection of Order in an $XXZ$ Antiferromagnet on a Kagomé Lattice
• Magnetic phase diagrams of classical triangular and kagome antiferromagnets
• Topological Magnetoelastic Excitations in Non-Collinear Antiferromagnets
• Weak ferromagnetic order breaking the threefold rotational symmetry of the underlying kagomé lattice in CdCu${}_3$(OH)${}_6$(NO${}_3$)${}_2\cdot$H${}_2$O
• Spin-Orbit Torques in Two-Dimensional Rashba Ferromagnets
• Topological spin Hall effects and tunable skyrmion Hall effects in uniaxial antiferromagnetic insulators
• Novel Phase Transitions in the Breathing Pyrochlore Lattice: 7Li-NMR on LiInCr4O8 and LiGaCr4O8

Cited by in corpus (3)

• Orbital Magnetic Moment of Magnons
• Spin superfluidity in noncollinear antiferromagnets
• Magnon spin transport around the compensation magnetic field in easy-plane antiferromagnetic insulators