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

这个小型企业创新研究(SBIR)第一阶段项目将开发表面活性剂包裹的磁性纳米颗粒的有序阵列，用于射频(RF)和自旋电子器件。制备纳米颗粒二维阵列的工具的出现促使人们共同努力开发不同的方法来制备尺寸和形状可控的磁性纳米结构。然而，将这些纳米结构融入到功能器件中，需要彻底了解纳米结构参数和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，极大地影响了重复性。这类新兴的有序纳米结构材料通过提供对纳米级形态参数的控制来绕过这个问题。最近发现了它在射频和自旋电子器件中的潜在应用。单分散包覆单域磁性纳米粒子的合成，可以精确控制纳米粒子的大小和厚度。随后将通过朗缪尔-布洛杰特技术制备有序的紧密堆积的单分子膜。对自旋独立隧穿、射频吸收和调谐特性的研究将有助于理解粒子尺寸在射频和自旋电子器件性能中的作用。表面活性剂包裹的纳米粒子阵列可以被开发成用于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。当沉积在铁电衬底上时，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(磁和电)。

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.