Fig. 2: Magnetic force microscopy images of the eight long-range ordered spin configurations.
From: Distinguishing artificial spin ice states using magnetoresistance effect for neuromorphic computing

a–h is corresponding to the Type A to Type H spin states in Fig. 1c. The eight states are created by the sequence of the applied magnetic field from θ = 45°, 292°, 158°, 112°, 202°, 248°, 338° to 112°.