Figure 4

Room temperature vertex maps for the high magnetization sample (Fe:Pd = 1:1.9) as a function of anneal temperature step from left to right, T = 493, 503, and 513 K; and with varied lattice constants from top to bottom, a = 450, 500, and 600 nm. Each map is based on an MFM image of 15 × 15 μm² and starts as a fully polarized T₂ background (blue dots) at the lowest temperature and thermally relaxes into almost entirely ground state T₁ vertices (green dots) within a small temperature window, ΔT = 20 K. Domain walls made up of T₂ and T₃ vertices separate ground state domains of different chirality in the final state.