Nuclear probes of magnetic order

磁序核探针

• 批准号: 42310-2013
• 负责人: Ryan, Dominic
• 金额: $ 2.33万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=633564
• 关键词: Nuclear; probes; magnetic; order

Rare earth magnets are now ubiquitous, being used in motors and actuators anywhere electricity is converted into motion. Examples range from motors in disc drives, moving both the disc and the read/write head, motors in portable power tools (drills, saws, drivers, etc...), remote door locks on cars. They touch every aspect of our modern technology. The material that enabled this revolution is the rare earth/iron compound Nd2Fe14B. This was discovered in the early 1980s as part of fundamental research on rapidly quenched liquid metals in which I was involved.In my work I seek to understand how things become magnetic - where their magnetic moment comes from - and how they order -- how, once the moment has formed, those moment choose to arrange themselves in a magnetic material. While my work is primarily fundamental in nature, a proper understanding of these basic issues is essential to the development of new, high performance magnetic materials.Over the next five years I will be concentrating on a group of rare earth based materials that are widely regarded as "off limits" or at least very difficult to study. However, as a result of techniques that I developed in collaboration with scientists at the Canadian Neutron Beam Centre, we have been able to open these materials to more detailed study. I will be looking at marginal magnetic materials based on samarium, europium and ytterbium where the magnetic moments are just forming and are easily affected by changes in materials chemistry. I will also be looking at very well defined moments on gadolinium compounds where experimental difficulties had previously precluded detailed study.

现在，稀土磁铁无处不在，用于电动机和执行器中的电力都转化为运动。示例范围从盘式驱动器中的电动机，盘式和读写头移动，便携式电动工具（钻头，锯，驱动器等），汽车上的远程门锁。他们触及我们现代技术的各个方面。启用这项革命的材料是稀土/铁化合物ND2FE14B。这是在1980年代初期发现的，这是我参与其中的快速淬火液体金属的基础研究的一部分。虽然我的工作主要是本质上的基础，但对这些基本问题的适当理解对于新的高性能磁性材料的发展至关重要。在接下来的五年中，我将集中精力于一组基于稀土的材料，这些材料被广泛认为是“非极限”或至少很难研究。但是，由于我与加拿大中子束中心的科学家合作开发的技术，我们已经能够打开这些材料以进行更详细的研究。我将研究基于samarium，europium和ytterbium的边际磁性材料，在磁矩刚刚形成，并且很容易受到材料化学变化的影响。我还将在gadolinium化合物上进行非常明确的时刻，这些时刻先前排除了详细的研究。