This paper is devoted to the study of fractional Schr\"odinger-Poisson type
equations with magnetic field of the type \begin{equation*}
\varepsilon^{2s}(-\Delta)_{A/\varepsilon}^{s}u+V(x)u+\varepsilon^{-2t}(|x|^{2t-3}*|u|^{2})u=f(|u|^{2})u
\quad \mbox{ in } \mathbb{R}^{3}, \end{equation*} where ε>0 is a
parameter, s,t∈(0,1) are such that 2s+2t>3,
A:R3→R3 is a smooth magnetic potential,
(−Δ)As​ is the fractional magnetic Laplacian,
V:R3→R is a continuous electric potential and
f:R→R is a C1 subcritical nonlinear term.
Using variational methods, we obtain the existence, multiplicity and
concentration of nontrivial solutions for ε>0 small enough