CAREER: Magnetocaloric Effect in Metallic Nanostructures

职业：金属纳米结构中的磁热效应

• 批准号: 1522927
• 负责人: Casey Miller
• 金额: $ 12.98万
• 依托单位: Rochester Institute of Tech
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-13 至 2017-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1522927&HistoricalAwards=false
• 关键词: CAREER; Magnetocaloric; Effect; Metallic; Nanostructures

TECHNICAL SUMMARY: This research will advance understanding of the magnetocaloric effect through the fabrication and characterization of novel nanoscale heterostructures composed of magnetic metals. Geometric confinement and physical proximity will be used to perturb and understand the structure-property relationships governing the entropy at relevant phase transitions. Investigations will include composition gradients, finite size effects, tailored interfaces, and magnetic anisotropies. Physical properties of the artificially structured materials will be characterized by means ranging from standard magnetometry and diffraction techniques to synchrotron and neutron probes available through collaborations with US National Laboratories. These studies will help enable the design of materials with enhanced entropic properties, which will ultimately be relevant for highly efficient magnetic refrigeration. NON-TECHNICAL SUMMARY: By fabricating otherwise standard materials in exotic nanostructures that do not exist in nature, it is possible to make new materials with properties superior to those of the individual materials. This will be accomplished by bringing the materials in contact at the nanoscale. Physical properties will be characterized using synchrotron and neutron scattering techniques at US National Laboratories and/or user facilities. Discoveries will be relevant to the emerging field of magnetocalorics, which has the potential for developing extremely high efficiency refrigeration using environmentally friendly refrigerants. The teaching and training of undergraduate and graduate students will be integrated into cutting edge interdisciplinary nanomagnetism research. Students will develop a network of future mentors, colleagues, and employers by disseminating work at conferences, participating in collaborations, and interacting with US National Laboratories. A scientific literature learning module will be formulated to increase undergraduates? scientific literacy, enable an easy and early transition into active research labs, and increase the quality of the undergraduate experience. USF's interdisciplinary Science, Technology, and Mathematics Education research cluster will help extend this module to other disciplines in order to reach a broad audience with interests ranging from the hard sciences to the health sciences.

技术摘要：这项研究将通过制造和表征由磁金属组成的新型纳米级异质结构来提高对磁联性效应的理解。几何限制和物理接近度将用于扰动和理解相关相变处熵的结构 - 核关系关系。研究将包括组成梯度，有限尺寸效应，量身定制的界面和磁各向异性。人为结构化材料的物理特性将以从标准磁力计和衍射技术到同步加速器和通过与美国国家实验室的合作获得的中子探针的方式来表征。这些研究将有助于实现具有增强熵特性的材料的设计，最终将与高效的磁制冷有关。非技术摘要：通过在自然界不存在的异国情调的纳米结构中制造否则标准材料，可以使具有优于单个材料的特性优越的新材料。这将通过在纳米级接触材料来实现。物理特性将使用美国国家实验室和/或用户设施的同步加速器和中子散射技术来表征。发现将与磁化磁化的新兴领域有关，该领域有可能使用环保制冷剂来开发极高的效率制冷。本科和研究生的教学和培训将纳入尖端跨学科的纳米磁学研究。学生将通过在会议上传播工作，参与合作并与美国国家实验室互动来建立一个未来的导师，同事和雇主的网络。将制定科学文献学习模块以增加本科生？科学素养，使早期过渡到活跃的研究实验室，并提高本科体验的质量。 USF的跨学科科学，技术和数学教育研究集群将有助于将该模块扩展到其他学科，以吸引广泛的受众群体，从硬科学到健康科学。