纳米棒阵列L10-FeNi/SmCo5交换耦合复合材料的微磁学模拟
Micromagnetic modelling of nanorods array-based L10-FeNi/SmCo5 exchange-coupled composites
摘要：
交换耦合纳米复合材料被认为是最有前途的高性能永磁体的生产材料，它可以超过钕的能量产品。在这项工作中，L10-FeNi/SmCo 5复合材料的纳米棒阵列的初始各向异性结构的基础上进行微磁学模拟。研究了织构对磁性能的影响。结果表明，即使L10-FeNi相晶粒各向异性轴偏离30%，其矫顽力也仅下降10%。为了最大限度地提高复合材料的磁性能，优化了120 × 120阵列的相互作用的纳米棒的微观结构的参数，并发现纳米棒直径为40 nm，棒间距离为12-20 nm。纳米棒的估计直径和阵列的堆积密度提供149 kJ m-3的能量积值。探讨了棒间距对能量积值的影响。提出了制备基于各向异性纳米结构的交换耦合复合材料的方法。
英文摘要：
Exchange-coupled nanocomposites are considered as the most promising materials for production of high-energy performance permanent magnets, which can exceed neodymium ones in terms of energy product. In this work, micromagnetic simulations of L10-FeNi/SmCo5 composites based on the initially anisotropic structure of nanorods array were performed. Texturing effect on magnetic properties was investigated. It was revealed that even 30 % of anisotropy axes misalignment of grains in L10-FeNi phase would lead to only 10 % drop of coercivity. To maximize magnetic properties of the composites, parameters of microstructure were optimized for 120 x 120 array of interacting nanorods and were found to be 40 nm nanorod diameter and 12-20 nm interrod distance. The estimated diameter of nanorods and the packing density of the array provide energy product values of 149 kJ m-3. Influence of interrod distance on energy product values was explored. Approaches for production of exchange-coupled composites based on anisotropic nanostructures were proposed.
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