Approximation of the Influence of Effective Magnetic Parameters on the Coercivity of Iron-Based Nanocrystalline Films

Abstract

The magnetization curves and hysteresis loops of Fe, Fe₉₀N₁₀, Fe₉₅Zr₅, Fe₈₅Zr₅N₁₀, and Fe₇₇Zr₇N₁₆ films were measured for determining coercive field H_c, saturation magnetization M_s, and the rms fluctuation of local magnetic-anisotropy field a^1/2H_a of these iron-based materials. A model approximation with empirical second-order polynomial and Pareto chart clearly demonstrates the influence of the grain size, anisotropy field a^1/2H_a, and saturation magnetization on the coercive field.