Electromagnetic properties of ferromagnetic micro and nanowires for magnonics

周期磁纳米结构中的激励可以用于信息传输和处理。这一新兴且迅速兴起的研究领域被称为磁振学。我的研究项目旨在设计、开发和表征这种人工纳米结构的磁性材料，以定制它们的电磁特性。本课题主要研究电镀在纳米多孔氧化铝膜上的铁磁纳米线阵列。重点是频谱的微波范围。通过在介质模板中结合金属和铁磁性纳米内含物，我们可以利用各种电荷和自旋输运现象，以及自旋和电荷密度波，来实现自然界中没有的磁和介电响应。这可能会导致能够在纳米尺度上传输和处理信息的新设备的发展。申请的资金主要用于资助2名博士生。具体目标是：(1)了解限制此类材料实际应用的耗散机制；(2)确定FMNW阵列中激发的集体磁模的性质；(3)研究线内激励对阵列集体激励的影响；(4)研究自旋波的参数放大是否能主动补偿特定模的损失。这项工作的成果包括新的可定制微波材料和微波电路（无线技术）的新设计可能性。

Excitations in periodic magnetic nanostructures can be used for information transport and processing. This new and rapidly emerging research field is called magnonics. My research program aims to design, develop and characterize such artificially nanostructured magnetic materials, to tailor their electromagnetic properties. This proposal is mainly concerned with arrays of ferromagnetic nanowires electroplated in nanoporous alumina membranes. The focus is on the microwave range of the spectrum. By combining metallic and ferromagnetic nanoinclusions in a dielectric template, we can exploit various charge and spin transport phenomena, along with spin and charge density waves, to achieve magnetic and dielectric responses not found in nature. This could lead to the development of new devices able to transport and process information at the nanoscale. The funds requested are essentially for the financial support of 2 PhD students. The specific objectives are: (1) to understand the dissipation mechanisms limiting practical applications in such materials; (2) to determine the nature of collective magnetic modes excited in FMNW arrays; (3) to investigate the effect of the intra-wire excitations on the collective excitations of the arrays; (4) to investigate whether the parametric amplification of spinwaves could actively compensate the losses of specific modes. Outcomes of the work include new tailorable microwave materials and new design possibilities for microwave circuits (wireless technologies).