Magnetization reversal modes and coercive field dependence on perpendicular magnetic anisotropy in FePt thin films

ROMÁN, A.; LOPEZ PEDROSO, A.; BOUZEHOUANE, K.; GÓMEZ, J.E.; BUTERA, A.; AGUIRRE, M.H.; SOARES, M MEDEIROS; GARCIA, C.; STEREN, L.B.

JOURNAL OF PHYSICS - D (APPLIED PHYSICS)

IOP PUBLISHING LTD

Año: 2023 vol. 56

0022-3727

The competition between shape and perpendicular magnetic anisotropies in magnetic thin films gives rise to unusual magnetic behaviors. In ferromagnetic thin films, the presence of an out-of-plane component of the magnetic anisotropy may induce a transition from planar to stripe-like magnetic domains above a critical thickness, t c . In this article, we present a detailed study of the magnetization switching mechanism in FePt thin films, where this phenomenon is observed. Using micromagnetic simulations and experiments, we found that below t c the reversal mechanism is well described by the two-phase model while above this thickness the magnetization within each stripe reverses by coherent rotation. We also analyzed the out-of-plane component of the magnetic anisotropy and its temperature dependence, probing that substrate-induced strains are responsible for the abnormal coercive field behavior observed for FePt films with t > t c .