A trilayer synthetic anti-ferromagnetic structure is set-up with bilinear surface exchange coupling betweeen Ni80Fe20 layers of 10 nm/20 nm/10 nm thickness and 2 nm Ru spacers between layers. The thicker layer initially points to the left and an opposing magnetic field is applied which is not strong enough to overcome the anti-ferromagnetic coupling. The thicker layer switches towards the field but the structure retains an anti-parallel magnetisation configuration.
The three layers are set-up using three separate computational meshes. A multilayered convolution algorithm was published, which allows exact computation of demagnetising fields in arbitrary multilayered structures, with arbitrary spacings and thicknesses: S. Lepadatu, Journal of Applied Physics 126, 103903 (2019).