  We study the formation of spin-1 symbiotic spinor solitons in a quasi-one-
(quasi-1D) and quasi-two-dimensional (quasi-2D) hyper-fine spin $F=1$
ferromagnetic Bose-Einstein condensate (BEC). The symbiotic solitons
necessarily have a repulsive intraspecies interaction and are bound due to an
attractive interspecies interaction. Due to a collapse instability in higher
dimensions, an additional spin-orbit coupling is necessary to stabilize a
quasi-2D symbiotic spinor soliton. Although a quasi-1D symbiotic soliton has a
simple Gaussian-type density distribution, novel spatial periodic structure in
density is found in quasi-2D symbiotic SO-coupled spinor solitons. For a weak
SO coupling, the quasi-2D solitons are of the $(-1, 0, +1)$ or $(+1, 0, -1)$
type with intrinsic vorticity and multi-ring structure, for Rashba or
Dresselhaus SO coupling, respectively, where the numbers in the parentheses are
angular momenta projections in spin components $F_z = +1, 0, -1$, respectively.
For a strong SO coupling, stripe and superlattice solitons, respectively, with
a stripe and square-lattice modulation in density, are found in addition to the
multi-ring solitons. The stationary states were obtained by imaginary-time
propagation of a mean-field model; dynamical stability of the solitons was
established by real-time propagation over a long period of time. The
possibility of the creation of such a soliton by removing the trap of a
confined spin-1 BEC in a laboratory is also demonstrated.
