Micromagnetic finite element study for magnetic properties of nanocomposite exchange coupled Nd₂Fe₁₄B/α-Fe multilayer systems

In this study, magnetic properties of exchange coupled nanocomposite multilayer thin films constructed alternately with magnetic hard Nd₂Fe₁₄B layers and soft α-Fe layers have been studied by micromagnetic finite element method (FEM). According to the results, effects of the thicknesses of layers and the magneto-crystalline anisotropy on the magnetic properties of the Nd₂Fe₁₄B/α-Fe multilayer systems have been estimated. On the other hand, the results have been analyzed by means of efficiency of interphase exchange coupling, which can be estimated by volume ratios of exchange coupled areas between magnetically hard Nd₂Fe₁₄B and soft α-Fe phase layers. The results show that the magnetic properties of exchange coupled Nd₂Fe₁₄B/α-Fe multilayer systems can be enhanced by efficient interphase exchange coupling between magnetically hard Nd₂Fe₁₄B layers and soft α-Fe layers. - Highlights: • Phase layer thicknesses dependence of magnetic properties of Nd₂Fe₁₄B/α-Fe multilayers. • Analyzation of the effectiveness of exchange coupling between the Nd₂Fe₁₄B and α-Fe layers. • Dependence of the magnetic properties on direction of external field of exchange coupled Nd₂Fe₁₄B/α-Fe multilayers. • Dependence of the magnetic properties on magneto-crystalline anisotropy of exchange coupled Nd₂Fe₁₄B/α-Fe multilayers.