EAGER: Magnonic logic devices with perpendicular magnetic anisotropy

基于磁性材料的新型计算设备的当前开发旨在提高效率并向现有的基于半导体的逻辑设备添加新的功能。磁振子逻辑器件是一种很有前途的候选器件，它利用纳米结构磁性材料中的磁化波来传输和处理信息，并执行逻辑运算。两个或多个波之间的相互作用在波载磁线的结被用来执行逻辑运算。构建这样的装置需要在各种形状的磁线中引导波以及形成磁线结的能力。磁线形状与直线的任何偏差都会导致不希望的波反射和散射，这显著限制了磁振子逻辑器件的能力。拟议的项目将对使用有可能克服这些限制的新型磁性材料进行可行性研究。建议评估使用具有优选面外磁化的超薄磁性膜的可行性。这些材料应该允许构建具有不受限制的磁性信息承载总线和逻辑结的几何形状的磁振子逻辑器件。这项研究将在微波电子学和磁存储技术领域产生更广泛的影响。此外，拟议中的研究将成为未来物理学家和工程师的独特培训基地。格鲁吉亚州立大学是少数民族服务机构，毕业的少数民族学生人数最多（主要是非洲裔美国人）比任何其他公立或私立学校在该国。该计划将促进研究生和本科生在磁学，光学和纳米技术领域的教育，并提供了各种各样的实验技能，其中纳米纤维将有最广泛的应用spectrum.The拟议的研究重点是基于垂直磁各向异性铁磁材料的磁子系统的可行性研究。周向磁各向异性将确保结构的面外磁化，从而支持各向同性前向体积静磁自旋波模式。该项目的目的是研究前向体积静磁自旋波在垂直磁各向异性结构铁磁薄膜中的传播，并评估将这些结构用于磁子逻辑器件的可行性。将使用表现出垂直磁各向异性的多层磁性材料。这些材料系统中的自旋波色散不受自旋波导形状变化的显著影响。因此，自旋波的传播不会被自旋波导形状变化引起的模式失配所改变。基于所提出的结构的磁逻辑器件将在没有偏置磁场的情况下表现出稳定的操作，而均匀的外部磁场可以用于重新配置它们的操作。拟议的项目将导致结构化的多层膜的制造和表征垂直磁各向异性导致在这些系统中的磁化动力学的基本理解。这包括通过铁磁共振测量评估损耗，以及测量可变形状自旋波导和自旋波导结中的自旋波传播。该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

Current development of novel computing devices based on magnetic materials is aimed at improving efficiency and adding new functionalities to existing semiconductor based logic devices. One of the promising candidates, magnonic logic device, utilizes waves of magnetization in nano-structured magnetic materials to transfer and process information, and perform logic operations. Interaction between two or more waves in junctions of wave carrying magnetic wires is used to perform logic operations. Building such device requires the ability to guide waves in magnetic wires of various shapes as well as forming magnetic wire junctions. Any deviation of a magnetic wire shape from a straight wire results in unwanted wave reflection and scattering that significantly limits capabilities of magnonic logic devices. The proposed project will perform a feasibility study of using novel magnetic materials that have potential to overcome such limitations. It is proposed to evaluate feasibility of using ultra-thin magnetic films with preferred out-of-plane magnetization. These materials should allow for building magnonic logic devices with unrestricted geometries of magnetic information-carrying busses and logic junctions. The proposed research will have a broader impact in the field of microwave electronics and magnetic memory technology. In addition, the proposed research will be a unique training ground for future physicists and engineers. Georgia State University is the minority serving institution which graduates the largest number of minority students (primarily African-American) than any other public or private school in the country. This program will facilitate graduate and undergraduate student education in the areas of magnetism, optics and nanotechnology and provide a wide variety experimental skills among which nanofabrication will have most broad applications spectrum.The proposed research focuses on the feasibility study of the magnonic systems based on ferromagnetic materials with perpendicular magnetic anisotropy. Perpendicular magnetic anisotropy will ensure the out-of-plane magnetization of structures resulting in support of isotropic forward volume magnetostatic spin wave modes. The project aims at investigating forward volume magnetostatic spin wave propagation in structured ferromagnetic films with perpendicular magnetic anisotropy and evaluating feasibility of using these structures for magnonic logic devices. Multi-layered magnetic materials exhibiting perpendicular magnetic anisotropy will be used. Spin wave dispersion in these material systems is not significantly affected by spin waveguide shape variation. Therefore, propagation of spin waves will not be altered by the mode-mismatching induced by spin waveguide shape variation. Magnonic logic devices based on the proposed structures will demonstrate stable operation in absence of biasing magnetic fields while uniform external magnetic fields can be used to reconfigure their operation. The proposed project will result in fabrication and characterization of structured multilayered films with perpendicular magnetic anisotropy leading to the fundamental understanding of magnetization dynamics in these systems. That includes assessing losses via ferromagnetic resonance measurements, and measuring spin wave propagation in variable shape spin waveguides and spin waveguide junctions. Microwave vector spectroscopy combined with magneto-optical Kerr microscopy experimental techniques will be used.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.