Theory of spin current in chiral helimagnet

Abstract

We give detailed description of the transport spin current in the chiral helimagnet. Under the static magnetic field applied perpendicular to the helical axis, the magnetic kink crystal (chiral soliton lattice) is formed. Once the kink crystal begins to move under the Galilean boost, the spin-density accumulation occurs inside each kink and there emerges periodic arrays of the induced magnetic dipoles carrying the transport spin current. The coherent motion of the kink crystal dynamically generates the spontaneous demagnetization field. This mechanism is analogous to the Döring-Becker-Kittel mechanism of the domain wall motion in ferromagnets. To describe the kink crystal motion, we took account of not only the tangential $\varphi$-fluctuations but the longitudinal $\theta$-fluctuations around the helimagnetic configuration. Based on the collective coordinate method and the Dirac's canonical formulation for the singular Lagrangian system, we derived the closed formulae for the mass, spin current and induced magnetic dipole moment accompanied with the kink crystal motion. To materialize the theoretical model presented here, symmetry-adapted material synthesis would be required, where the interplay of crystallographic and magnetic chirality plays a key role there.

16 pages, 6 figures, to be published in Phys. Rev. B

References in corpus (15)

• Spintronics: Fundamentals and applications
• Universal Intrinsic Spin-Hall Effect
• Dissipationless Quantum Spin Current at Room Temperature
• Theory of Current-Driven Domain Wall Motion: A Poorman's Approach
• Anatomy of Spin-Transfer Torque
• Modification of the Landau-Lifshitz Equation in the Presence of a Spin-Polarized Current in CMR and GMR Materials
• Spin Transfer Torque for Continuously Variable Magnetization
• Non-collinear spin transfer in Co/Cu/Co multilayers
• Formation of a magnetic soliton lattice in copper metaborate
• Equilibrium spin currents and magnetoelectric effect in magnetic nanostructures
• Spin Dynamics and Spin Transport
• Persistent Spin Currents in Helimagnets
• Transport magnetic currents driven by moving kink crystal in chiral helimagnets
• Correlations in the Sine-Gordon Model with Finite Soliton Density
• What are spin currents in Heisenberg magnets?

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• Coherent sliding dynamics and spin motive force driven by crossed magnetic fields in chiral helimagnet
• Spin Structure of the Anisotropic Helimagnet Cr${}_{1/3}$NbS${}_2$ in a Magnetic Field
• A spin dynamics approach to solitonics
• Spin currents, spin torques, and the concept of spin superfluidity
• Cavity Optomechanics of Topological Spin Textures in Magnetic Insulators
• Metastable solitonic states in the strained itinerant helimagnet FeGe
• Origin of adiabatic and non-adiabatic spin transfer torques in current-driven magnetic domain wall motion
• Monte Carlo study of magnetoresistance in a chiral soliton lattice
• Hidden Galilean symmetry, conservation laws and emergence of spin current in the soliton sector of chiral helimagnet
• The spiral spin state in a zigzag spin chain system
• Spin operator and spin states in Galilean covariant Fermi field theories
• Magnetic field-induced chiral soliton lattice in the bulk magnetoelectric helimagnet Cu${}_2$OSeO${}_3$
• Soliton penetration from edges in a monoaxial chiral magnet
• Spin-current diode with a monoaxial chiral magnet