2008/06/30 by I. G. Bostrem, Jun-ichiro Kishine, Jun‐ichiro Kishine +2 · 2 citations
Physics and Astronomy · #Classical mechanics #Condensed matter physics #Dipole #Galilean #Magnetic dipole #Magnetic field #Magnetic moment #Magnetic properties of thin films #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Skyrmion #Spin (aerodynamics) #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.78.064425
16 pages, 6 figures, to be published in Phys. Rev. B
arxiv created 2008/08/14 · openalex publication_date 2008/08/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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. To describe the kink crystal motion, we took account of not only the tangential \ensuremathφ fluctuations but the longitudinal \ensuremathθ fluctuations around the helimagnetic configuration. Based on the collective coordinate method and the Dirac canonical formulation for the singular Lagrangian system, we derived the closed formulas 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.