Broadband Conductive Atomic Force Microscopy for Studying Magneto-electronic Nanostructures

导电原子力显微镜是测量电阻纳米级变化的通用工具。这项研究计划的目标是在广泛的频率范围内扩展其能力，以研究磁电子设备。计算机和智能手机包含纳米级存储和高速运行的逻辑设备，在更小、更快、更节能的电子产品的竞争中，许多新的磁电设备正在被探索。新的导电力显微镜工具将能够在纳米制造的不同阶段快速测试原型设备，这将有助于优化加工条件并加快开发周期。此外，该技术的相关性将用于磁热疗癌症治疗，它使用100 kHz - 1 MHz范围内的激励，用于磁控制加热。这项研究的结果将与教育和培训研究生和本科生的推广活动有关，并通过本科生研究项目和IEEE磁学学会展示扫描探针显微镜的原理。拟议的研究计划将扩展导电原子力显微镜，以研究自旋电子器件在宽频率范围内的热噪声和磁化动力学，并通过对纳米颗粒和纳米盘的测量来验证其操作。为了测试高频扫描探针的操作，并在纳米级水平上获得新的知识，将研究几种磁性纳米结构。晶体取向纳米颗粒将被光刻成图化，用于研究导致超顺磁行为的热波动的尺寸依赖性，以及应用于具有显著静磁相互作用的成图化纳米颗粒组件的孤立颗粒行为。在其共振频率（100-500 MHz）附近，将研究图案化磁涡结构。在GHz范围内，重点将放在定向纳米颗粒的铁磁共振上。

Conductive atomic force microscopy is a versatile tool for measuring nanoscale variations in the electrical resistance. The goal of this research program is to extend its capabilities over a broad range of frequencies to study magneto-electronic devices. Computers and smart phones contain nanoscale storage and logic devices that operate at high speeds, and in a race for smaller, faster, and more energy efficient electronics, many novel magneto-electronic devices are being explored. The new conductive force microscopy tool will enable rapid testing of prototype devices at different stages of nanofabrication, which will assist in optimizing the processing conditions and speed up the development cycle. In addition, the relevancy of the technique will be for magnetic hyperthermia cancer treatment, which uses excitation in the 100 kHz - 1 MHz range, for magnetically controlled heating. The outcome of this research will be related to educational and outreach activities of training graduate and undergraduate students and by demonstrating the principles of scanning probe microscopy through undergraduate research projects and the IEEE Magnetics Society.The proposed research program will extend conductive atomic force microscopy to investigate thermal noise and magnetization dynamics in a spintronic devices at broad range of frequencies and by validating it operation through measurements on nanoparticles and nanodisks. Several kinds of magnetic nanostructures will be studied in order to test the operation of the high frequency scanning probe, and to gain new knoweldge at the nanosclae level. Crystallographically oriented nanoparticles will be patterned lithographically for investigation of the size-dependence of thermal fluctuations leading to superparamagnetic behavior, and isolated particles behavior applied to patterned nanoparticle assemblies with significant magnetostatic interactions. Patterned magnetic vortex structures will be investigated near their resonant frequencies (100-500 MHz). In the GHz range, the focus will be on ferromagnetic resonance of the oriented nanoparticles.