科研之友
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摘要
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 SmFe2 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 SmFe2, 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.
- 出版日期2008-2
