Both static and dynamic magnetic properties of amorphous ferromagnetic thin-filmswere investigated to reveal the effect of thickness-dependent anisotropy and domain wall structure. Amorphous Fe(66)Co(17)B16Si(1) and Fe39Co39Nb6Cu1B5 alloy thin-films with different thicknesses are deposited on Si for comparison. The increase of thickness results in an indiscipline change of both ferromagnetic resonance and in-plane uniaxial anisotropy at a critical value of 80 nm. The phenomenon is ascribed to the evolution of magnetic domain wall from Neel type to Bloch type as a result of the competition between in-plane and out-of-plane anisotropy. OOMMF is used to simulate the magnetic reversal process, so that the domain wall change is proved. (C) 2016 Elsevier B.V. All rights reserved.