SBIR Phase I: Ordered Arrays of Surfactant-Coated Magnetic Nanoparticles for RF and Spintronic Applications

这个小企业创新研究（SBIR）第一阶段项目将开发表面活性剂涂层磁性纳米颗粒的有序阵列，用于射频（RF）和自旋电子器件。制造二维纳米颗粒阵列的工具的出现，促使人们共同努力，开发不同的方法来生产尺寸和形状可控的磁性纳米结构。然而，将这些纳米结构整合到功能器件中，需要彻底了解纳米结构参数与电磁性能之间的关系。缺乏对颗粒大小和分离等关键参数的控制极大地影响了再现性。新生的有序纳米结构材料通过提供对纳米尺度形态参数的控制，规避了这个问题。在射频和自旋电子器件的潜在应用最近被确定。单分散涂层单畴磁性纳米颗粒将被合成，具有精确控制尺寸和涂层厚度。随后将通过Langmuir-Blodgett技术制备有序密装单层薄膜。研究自旋隧穿和射频吸收调谐特性将有助于理解粒子尺寸对射频自旋电子器件性能的影响。表面活性剂包覆的纳米颗粒阵列可以发展成高分辨率磁传感的自旋电子器件，这对高密度记录工业至关重要。当沉积在铁电基板上时，这些阵列将在微贴片天线、移相器、谐振器等设备中提供双重调谐（磁性和电性）。

This Small Business Innovation Research (SBIR) Phase I project will develop ordered arrays of surfactant-coated magnetic nanoparticles for application in Radio Frequency (RF) and spintronic devices. The advent of tools to fabricate 2-D arrays of nanoparticles has led to concerted efforts in the development of different methods to produce size and shape-controlled magnetic nanostructures. The incorporation of these nanostructures in functional devices however, requires a thorough understanding of the relationship between nanostructural parameters and electromagnetic performance. The lack of control over crucial parameters like particle size and separation drastically compromises reproducibility. The nascent class of ordered nanostructured materials circumvents this problem by offering control over nanoscale morphological parameters. The potential application in RF and spintronic devices has recently been identified. Monodisperse coated single domain magnetic nanoparticles will be synthesized, with precise control over size and coating thickness. Subsequent fabrication of ordered closepacked monolayer films will be via the Langmuir-Blodgett technique. A study of the spindependent tunneling and RF absorption and tuning characteristics will help understand the role of particle size in RFand spintronic device performance.Arrays of surfactant-coated nanoparticles can be developed into spintronic devices for high-resolution magnetic sensing, vital to the high-density recording industry. When deposited on ferroelectric substrates, these arrays will provide dual tuning (magnetic and electrical) in devices like micro-patch antennas, phase-shifters, resonators etc.