Bottom-up Approaches to Fabrication of Nanocomposite Magnets
讲座名称：
Bottom-up Approaches to Fabrication of Nanocomposite Magnets
讲座时间：
2011-07-01
讲座人：
刘平
形式：
校区：
兴庆校区
实践学分：
讲座内容：
应物质非平衡合成与调控教育部重点实验室主任宋晓平教授邀请，美国德州大学阿灵顿分校著名磁学专家刘平（Liu Ping）教授将于7月1日来我校访问，并将于7月1日上午9:30分在理科楼202会议室做学术报告。
学术报告时间：7月1日上午9:30分
学术报告地点：理科楼202会议室
学术报告人：刘平（Liu Ping）
学术报告题目：Bottom-up Approaches to Fabrication of Nanocomposite Magnets
报告摘要：
Theoretic calculations have predicted very high energy products for exchange-coupled hard/soft nanocomposite magnets. However, it has been proved to be very challenging to realize the prediction in experiments. Progress in our recent experiments has been made by adopting “bottom-up” approaches to fabricate nanocomposite magnets. The first step of this novel approach involves synthesis and characterization of hard and soft magnetic nanoparticles including FePt, Sm-Co, Nd-Fe-B and Fe-Co nanoparticles. Novel processing techniques including chemical solution methods, salt-matrix annealing and surfactant-assisted ball milling have been applied to prepare the nanoparticles.
Mixed powder particles were then consolidated with unconventional compaction techniques including warm compaction and spark plasma sintering. Thanks to the well controlled nanoparticle size and size distribution, strong magnetic exchange coupling has been achieved between the hard and the soft magnetic phases in the compacted samples, which makes the bottom-up approach a promising one for producing bulk nanocomposite magnets with enhanced energy products.
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