MRI: Development of a Broadband 330 GHz Variable Temperature Magnetic Resonance Spectrometer System

该主要研究仪器奖资助了频率高达330千兆赫（GHz）的宽带高频磁共振系统的开发，温度介于液氦和室温之间。磁共振是材料和医学研究中最重要的现象之一，在无线通信、雷达、导航、遥感、无线电力传输和成像诊断等领域有着广泛的应用。铁磁共振（FMR）和电子顺磁共振（EPR）已经成为理解磁性激发和自旋动力学的主要表征技术。探测和理解新材料和异质结构的磁共振特性对于发展变革技术至关重要，例如下一代信息技术，电信和数据存储，这些技术极大地影响了我们的日常生活。目前，绝大多数的磁共振光谱仪被限制在1-40 GHz的频率范围内。即将开发的仪器将实现高达330 GHz的宽带、变频磁共振测量，弥合传统上重要的GHz应用（如手机和雷达）与太赫兹（THz）技术新前沿之间的差距。这将是中西部地区共享用户设施中该频率范围内的第一台磁共振光谱仪，并将大大加强和扩大对新基本现象的调查，并为俄亥俄州立大学和中西部地区的研究人员开发改变范式的技术。此外，该仪器的开发将为培养一大批高频磁共振技术和微波仪器专家的博士后、研究生和本科生提供难得的机会，填补国家的重要需求。该工具将在俄亥俄州立大学吸引和培养妇女和代表性不足的少数民族学生从事科学研究的一些外展项目中发挥重要作用。在这项核磁共振奖的支持下，俄亥俄州立大学的一个研究小组将开发一种宽带、高灵敏度的磁共振光谱仪系统，该系统将为研究磁激发、动态自旋输运和微波器件应用提供不可或缺的内部工具。它将使俄亥俄州立大学和该地区其他机构的大量研究小组能够对各种各样的新材料和结构进行调查。MRI团队将设计并建造一系列谐振频率在10至320 GHz之间的磁共振腔，用于在低温14特斯拉超导磁体中运行，这为揭示铁磁体、反铁磁体、拓扑绝缘体、skyrmions和非磁性材料的异质结构中负责磁行为和动态产生自旋电流的潜在机制提供了一个以前未被探索的领域。该仪器将位于纳米系统实验室（NSL），这是俄亥俄州立大学一个运行良好的用户设施，对所有学术和工业用户开放。该仪器将在自旋结构材料（如拓扑绝缘体和skyrmions）中利用高速、高效、相干自旋输运和非凡的动态自旋操纵，实现自旋电子学新体制的变革性研究。这些见解将为开发下一代自旋电子器件提供基础

This Major Research Instrumentation award funds the development of a broadband high frequency magnetic resonance system with frequencies up to 330 gigahertz (GHz) at temperatures between liquid helium and room temperature. Magnetic resonance is one of the most important phenomena in materials and medical research, which have led to a broad range of applications in wireless communication, radar, navigation, remote sensing, wireless power transmission, and imaging diagnostics. Ferromagnetic resonance (FMR) and electron paramagnetic resonance (EPR) have been major characterization techniques for understanding the magnetic excitations and spin dynamics in fundamentally important and technologically relevant materials. Probing and understanding magnetic resonance properties of new materials and heterostructures are essential for developing transformative technologies, such as next generation information technology, telecommunication, and data storage, which have dramatically affected our everyday life. Currently, the vast majority of the magnetic resonance spectrometers are limited to a frequency range of 1-40 GHz. The instrument to be developed will enable broadband, variable frequency magnetic resonance measurements up to 330 GHz, bridging the gap between traditionally important GHz applications, e.g. cell phones and radar, and the new frontier of terahertz (THz) technologies. This will be the first magnetic resonance spectrometer within this frequency range at a shared user facility in the Midwest region, and will significantly strengthen and expand the investigation of novel fundamental phenomena and the development of paradigm-changing technologies for researchers at The Ohio State University and from across the Midwest region. In addition, the development of this instrument will offer a rare opportunity to train a large number of postdoctoral researchers, graduate and undergraduate students to become experts in high frequency magnetic resonance technologies and microwave instrumentation, filling a vital national need. This instrument will play an important role in a number of outreach programs at Ohio State to attract and nurture women and underrepresented minority students in scientific research. Supported by this MRI award, a research team at The Ohio State University will develop a broadband, high sensitivity magnetic resonance spectrometer system which will provide an indispensable in-house tool for studying magnetic excitations, dynamic spin transport and microwave device applications. It will enable investigations of a wide array of novel materials and structures for a large number of research groups at The Ohio State University and other institutions in the region. The MRI team will design and build a series of magnetic resonance cavities with resonant frequencies between 10 and 320 GHz for operation in a cryogenic 14 tesla superconducting magnet, which offers access to a previously unexplored regime for revealing the underlying mechanisms responsible for the magnonic behavior and dynamically generated spin currents in heterostructures of ferromagnets, antiferromagnets, topological insulators, skyrmions, and nonmagnetic materials. This instrument will be located in the NanoSystems Laboratory (NSL), a well-run user facility at Ohio State that is open to all academic and industrial users. The instrument will enable transformative research in novel regimes of spintronics utilizing high speed, high efficiency, coherent spin transport and extraordinary dynamic spin manipulation in spin-textured materials such as topological insulators and skyrmions. These insights will provide the foundation for developing next generation spin-electronic devices