  We show that the easy-axis (EA) magnetic domains formed in a quenched
ferromagnetic spinor condensate are described by percolation theory. We
introduce a generalized spin rotation to vary the proportion of positive and
negative EA domains, allowing us to explore domain percolation. Using
simulations we investigate the finite-size scaling behaviour to extract the
correlation length critical exponent and the transition point. We analyse the
sensitivity of our results to the early-time dynamics of the system, the
quadratic Zeeman energy, and the threshold condition used to define the
positive (percolating) domains.
