  We have imaged magnetization textures of permalloy films patterned into
Penrose P2 tilings (P2T) using scanning electron microscopy with polarization
analysis (SEMPA). P2T film segments have near-uniform, bipolar magnetization,
similar to artificial spin ices, but with asymmetric vertex coordination that
induces a more complex spin ice behavior mediated by exchange interactions in
vertex domain walls. Numerical simulations including long-range dipole
interactions agree with SEMPA images of as-grown P2T, and predict a
ferromagnetic ground state for a 2D P2T lattice of classical Ising spins.
