History dependence of the magnetic properties of single-crystal Fe 1 − x Co x Si

摘要: Cubic chiral magnets crystallizing in space group $P$2${}_{1}$3 give rise to a spin structure of nontrivial topology, the so-called skyrmion lattice. The strongly doped semiconductor Fe${}_{1\ensuremath{-}x}$Co${}_{x}$Si is fascinating member this material class compounds as it exhibits helimagnetism over wide compositional range. authors study magnetic properties itinerant magnet for different values $x$, combine their results with previous reports, and infer phase diagrams. latter are rather isotropic but depend on field temperature history. In particular, when cooled an applied field, lattice may persist down lowest temperatures. This history dependence, combination variation temperature, length scale order by means tuning, makes excellent future experiments studying skyrmions.