Abstract

A model based on classical statistical mechanics is used to calculate magnetization curves for cubic and mixed-anisotropy systems. Our results on Fe, Ni and SmFe 2 are in agreement with measurements on bulk single crystals of these materials. For example, the easy axes of magnetization at room temperature for Fe and Ni are [1 0 0] and [1 1 1], respectively. For SmFe 2, the easy magnetization directions at 77 K and room temperature are [1 1 0] and [1 1 1], respectively, in agreement with experiment. For the mixed-anisotropy case, we study two model systems in which both uniaxial and biaxial anisotropies are present. In the easy-[1 0 0] system, a magnetization jump to saturation is found if both anisotropies are of the same order of magnitude in contrast to easy-[1 1 0] systems where magnetization jumps are found even if the biaxial anisotropy is negligible. Examples of mixed-anisotropy material systems that exhibit a discontinuous jump in magnetization, demonstrated by our calculation, are ultra-thin films of Co/Cu and Fe on stepped Ag(0 0 1) substrates.

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