Spin textures with nontrivial topology, such as vortices and skyrmions, have attracted
attention as a source of unconventional magnetic, transport, and optical phenomena …

We review recent developments of formulations to calculate the Dzyaloshinskii–Moriya (DM)
interaction from first principles. In particular, we focus on three approaches. The first one …

We theoretically investigate multiple-Q spin textures, which are composed of superpositions
of spin density waves with different wave numbers, for an effective spin model of …

Multiple-Q magnetic states, such as a skyrmion crystal, become a source of unusual
transport phenomena and dynamics. Recent theoretical and experimental studies clarified …

We theoretically study noncoplanar spin textures in polar magnetic conductors. Starting from
the Kondo lattice model with the Rashba spin-orbit coupling, we derive an effective spin …

We investigate the stability of the skyrmion crystal phase in a tetragonal polar system with
the Dzyaloshinskii-Moriya interaction by focusing on the symmetry of ordering wave vectors …

Coupling between spin and charge degrees of freedom in electrons is a source of various
electronic and magnetic properties of solids. We theoretically study charge density waves …

In recent years, skyrmions have been found in a plethora of different materials
encompassing a broad range of bulk compounds as well as a large number of thin film …

We study the nonequilibrium effects of spin and/or electric currents on the helical indirect
exchange interactions of local spins that embedded in general open electronic systems …