Fe films with spins spiral states from ab initio

Thickness-dependent magnetic structure of ultrathin Fe/Ir(001) films: From spin-spiral states toward ferromagnetic order.
A. Deák and L. Szunyogh, B. Ujfalussy
Phys. Rev. B 84, 224413 (2011)

Ground-state spin configurations of the Fe monolayer with experimental layer relaxation (a) without and (b) with
biquadratic couplings.