Fig. 5: Simulation results for models with thick anisotropic surfaces.
From: Anisotropic resistance with a 90° twist in a ferromagnetic Weyl semimetal, Co2MnGa
a, b We vary the thickness of the anisotropic surface sections δ and tune β to match the experimental value of R12,43 (α is fixed at 100). For δ = {10, 100, 300, 500} nm the optimal β were found to be 4.31 × 104, 790, 110, and 30, respectively. The red columns represent the experimental resistances and the teal columns show the simulation results. Panel a (b) presents the results with the current contacts \(\overrightarrow{ij}\)\(\parallel \hat{{{\bf{x}}}},\hat{{{\bf{y}}}}\) (\(\parallel \hat{{{\bf{z}}}}\)). As δ is increased, the simulation results largely diverge from the experimentally observed anisotropy. In particular, the high-conductance-axis configurations (ij = 14) no longer match those of an isotropic slab—a key feature of the experimental anisotropy—and the z-axis non-local resistance anisotropy becomes much less extreme.
