High magnetic field and neutron scattering measurements of magnetic materials

磁性材料的高磁场和中子散射测量

• 批准号: 249706-2006
• 负责人: Adams, Carl
• 金额: $ 1.46万
• 依托单位: St. Francis Xavier University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=394451
• 关键词: magnetic; field; neutron; scattering; measurements

The proposed research program depends on recent additions to my new laboratory at St. Francis Xavier University, my role at the Spallation Neutron Source (SNS), and my collaboration in the Advanced Foods and Materials Network (AFMNet).  My laboratory now includes an easy-to-use but powerful magnet, which can reach very high magnetic fields.  The SNS being built in Oak Ridge, Tennessee, will be the most powerful and modern scientific research facility of its type in the world, and I am personally involved in the development of one of the instruments.  AFMNet is a national collaboration of natural scientists, engineers, health researchers, social scientists, and lawyers working on various facets of food and bio-material advances.  My first research thrust is looking at magnetic materials.  One group of materials has a wavelike magnetic structure, and I want to see how that structure is affected by replacing atoms with different ones and by applying a magnetic field.  Studying these relatively simple materials will tell us more about related, complicated materials with important practical applications.  Another group has materials which could be used as a magnetic sensors, in computer hard drives, or possibly in new, faster types of electronics.  Again, I will be looking for effects caused by magnetic fields, but also by squeezing the material.  The other group is shape-memory alloys, which can be bent and return to their original shape if heated, but also expand and contract in a magnetic field.  Neutron scattering at either the Canadian Neutron Beam Centre in Chalk River or the SNS can be used to look at the magnetic structures and interactions, which are closely related to their interesting properties.  In AFMNet, my team is studying small spheres (roughly 100 billionths of metre across) formed from the molecules that make up the outer walls of bacteria.  Small-angle neutron scattering acts as a powerful microscope to see how these spheres behave as they interact with simple chemicals or with candidates for new antibiotics.  Studying this interaction and seeing if we can describe it using physical models is very important, since bacteria play such an important role in human health.

拟议的研究计划取决于我在圣弗朗西斯泽维尔大学的新实验室的最新进展，我在Spanish中子源（SNS）的角色，以及我在先进食品和材料网络（AFMNet）的合作。我的实验室现在包括一个易于使用但功能强大的磁铁，它可以达到非常高的磁场。SNS正在田纳西州的橡树岭建造，AFMNet将成为世界上同类型的最强大、最现代化的科学研究设施，我本人参与了其中一种仪器的开发。AFMNet是一个由自然科学家、工程师、健康研究人员、社会科学家、我的第一个研究方向是磁性材料。有一类材料具有波浪状的磁性结构，我想看看用不同的原子替换原子和施加磁场是如何影响这种结构的。研究这些相对简单的材料将告诉我们更多相关的，具有重要实际应用的复杂材料。另一类材料可用作磁传感器，用于计算机硬盘驱动器，或可能用于新的，更快的电子产品。同样，我将寻找磁场引起的效应，但也通过挤压材料。另一组是形状记忆合金，如果加热，它可以弯曲并恢复到原来的形状，在乔克河的加拿大中子束中心或SNS的中子散射可以用来观察磁结构和相互作用，这是密切相关的，他们的有趣的性质。在AFMNet，我的团队正在研究（直径约为100亿分之一米）由构成细菌外壁的分子形成。小-中子角散射就像一个强大的显微镜，可以观察这些球体在与简单的化学物质或新抗生素候选物相互作用时的行为。研究这种相互作用并看看我们是否可以使用物理模型来描述它是非常重要的，因为细菌在人类健康中起着如此重要的作用。