Figure 3: High-pressure evolution of the magneto-crystalline anisotropy of CuO.
From: Room-temperature spin-spiral multiferroicity in high-pressure cupric oxide
MAE of CuO calculated for the GS AF1 magnetic structure7 where MAE=E[uvw]–E[010] and E[uvw] is the energy deduced from SO calculations with magnetization along the [uvw] crystallographic direction. (a) The three-dimensional shape of MAE shows that the easy axis of magnetization at 0 GPa is the b axis, that is, [010] direction of the crystallographic cell. (b) MAE in the plane normal to the b axis, which is reduced by pressure. (c) Exponential decay of MAE with pressure, as illustrated for the [−101] direction.
