Magnetization dynamics for a square-shaped Py element

Remanent magnetization states (shown as color maps of the horizontal magnetization projection) of various thin films initially saturated in the vertical direction: left image – Py, middle – fcc Co and right – hcp Co. All films are 20 nm thick and have identical random polycrystalline structures with the average grain size 20 nm. Magnetocrystalline anisotropy constants are: K_Py = 5 x 10⁴ erg/cm³ (cubic aniso­tropy), K_Co,fcc = – 6 x 10⁵ erg/cm³ (cubic anisotropy), K_Co,hcp = 4 x 10⁶ erg/cm³ (uniaxial anisotropy). Lateral size of the area shown on all images is 2 x 5 μ² (discretized into 400 x 1000 cells).