Abstract
The peculiarities of spin and charge kinetics in helical magnetic metals that are due to forces acting on the magnetic moment of conduction electrons in inhomogeneous magnetic field have been considered. Analyzing the equations of motion for non-equilibrium spin density shows that an electric field directed along the axis of the helix produces conduction-electron spin polarization along this direction. Under the same conditions, the directions of polarization of the spin current and polarization of the locally equilibrium spin density are collinear. The specific structure of the effective exchange field acting on the conduction electrons in helical magnets causes two additional spin relaxation mechanisms to emerge. In addition to the mechanism of spin-lattice relaxation, “diffusion” and “precession” mechanisms of spin relaxation exist in conductive helical magnets. The diffusion mechanism is analogous to the Dyakonov-Perel spin relaxation mechanism. The key point is that the inhomogeneities of a magnetic field initiate a coupling between the spin and charge systems. It has been shown that, in a helical metal, the electrical conductivity decreases due to the action of the non-uniform exchange magnetic field.
Highlights
The subject of the research is the spin-dependent transport properties of conductive helimagnets
Analyzing the equations of motion for non-equilibrium spin density shows that an electric field directed along the axis of the helix produces conduction-electron spin polarization along this direction
We focus on the peculiarities of charge and spin kinetics that arise due to the action of forces acting on the magnetic moment of conduction electrons in an inhomogeneous magnetic field
Summary
The subject of the research is the spin-dependent transport properties of conductive helimagnets. The authors of [2], using a model of spin-density waves, showed that the kinetic magnetoelectric effect may exist in metallic antiferromagnets with a helical spin-density wave. They emphasized that an appropriate correction to conductivity in such metals should be accounted for. The paper [4] is one of the recent works in which an attempt was made to describe electron transport in a medium with a helical magnetic structure. It interprets charge kinetics through the Boltzmann equation.
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