  In this paper, we investigate a Stokes-Magneto system with fractional
diffusions. We first deal with the non-resistive case in $\mathbb{T}^{d}$ and
establish the local and global well-posedness with initial magnetic field
$\mathbf{b}_0\in H^{s}(\mathbb{T}^d)$. We also show the existence of a unique
mild solution of the resistive case with initial data $\mathbf{b}_0$ in the
critical $L^{p}(\mathbb{R}^d)$ space. Moreover, we show that
$\|\mathbf{b}(t)\|_{L^{p}}$ converges to zero as $t\rightarrow\infty$ when the
initial data is sufficiently small.
