MRI: Development of a Broadband Time-Resolved Magneto-Optical and Second Harmonic Generation Magnetometer for Research and Education in Undergraduate Institution

技术摘要科罗拉多大学科罗拉多斯普林斯分校（UCCS）将开发一种使用15 fs脉冲激光系统的时间分辨磁光和二次谐波产生（SHG）磁强计。该仪器的主要优点是：由于两种技术（表面与体自旋波）的不同表面灵敏度，可识别激发的自旋波;使用相同设置（从“准静态”到太赫兹）访问宽频率范围的灵活性;时间精度受飞秒脉冲宽度的限制;以及获得矢量分辨磁化响应的能力。该系统将用于研究自旋动力学与纳米技术的应用，特别是自旋波传播和阻尼。具体的研究项目将是：自旋波聚焦，热激发自旋波的传播，局部行为对整体磁化阻尼的影响，以及液晶的SHG响应。教育推广将包括本科生参与仪器的开发，他们将在那里接受尖端技术（高频应用、超快激光技术等）实验技术的培训。该仪器也将被用作光学和固态实验室的一部分。UCCS将提供一个修改类使用这种仪器的科学和工程专业，为他们提供必要的培训，为他们未来的职业生涯在当地的纳米技术和生物医学行业。该仪器还将支持跨学科的本科生研究（物理学，材料研究，生物学和化学）。为通信和计算机等应用开发新的和改进的电子设备需要了解通常发生在超短（飞秒）时间帧内的基本材料过程（为了可视化一飞秒，光从地球到月球的传播时间约为1.3秒;在一飞秒内，光传播的距离小于人类头发的厚度）。在所有这些应用中，材料的磁性行为尤其重要。位于科罗拉多斯普林斯的科罗拉多大学（UCCS）将开发一种测量磁特性的仪器，这将提供一套独特的技术，大大加强我们在超快现象领域的研究，并将其应用于纳米技术。这一发展项目还将包括教育推广。本科生将参与仪器的开发，并接受尖端技术（高频应用，超快激光技术等）的实验技术培训。该仪器将作为物理专业高级实验室课程的一部分。UCCS还将为科学和工程专业提供使用该仪器的修改课程，为他们提供在当地纳米技术和生物医学行业未来职业所需的培训。使用该仪器的研究活动将包括导致例如：用于通信的更快和更小的纳米电子器件的开发，用于计算机存储器的更好材料的开发，以及用于显示器的液晶的研究的方案。

Technical AbstractThe University of Colorado at Colorado Springs (UCCS) will develop a time-resolved magneto-optical and second harmonic generation (SHG) magnetometer using a 15-fs pulse laser system. The main advantages of the instrument are: availability to identify the excited spin waves due to the different surface sensitivity of both techniques (surface versus bulk spin waves); flexibility to access a wide frequency range using the same setup (from "quasistatic" to terahertz); time precision limited by the width of the femtosecond pulses; and ability to obtain vector resolved magnetization response. The system will be used to investigate spin dynamics with applications in nanotechnology, particularly spin wave propagation and damping. The specific research projects will be: spin waves focusing, propagation of thermally excited spin waves, influence of the local behavior on the overall magnetization damping, and SHG response from liquid crystals. Educational outreach will include the participation of undergraduate students in the development of the instrument, where they will receive training in experimental techniques with cutting edge technology (high-frequency applications, ultrafast laser techniques, etc.). The instrument will also be used as a part of the Optical and Solid State Labs. UCCS will offer a modified class using this instrument to science and engineering majors, providing them with the training necessary for their future careers in the local nanotechnology and biomedical industries. The instrument will also support interdisciplinary undergraduate research (physics, materials research, biology, and chemistry). Lay AbstractThe development of new and improved electronic devices for such applications as communication and computers requires an understanding of fundamental material processes that often occur in ultra-short (femtosecond) time frames (in order to visualize one femtosecond, light travels from the Earth to the Moon in about 1.3 seconds; in one femtosecond, light travels a distance less than the thickness of a human hair). The magnetic behavior of materials is especially important in all of these applications. The University of Colorado at Colorado Springs (UCCS) will develop an instrument to measure magnetic properties that will provide a unique set of techniques to greatly enhance our research in the field of ultrafast phenomena with applications in nanotechnology. This development project will also include educational outreach. Undergraduate students will participate in the development of the instrument and receive training in experimental techniques with cutting edge technology (high-frequency applications, ultrafast laser techniques, etc.). The instrument will be used as a part of the advanced laboratory classes offered to physics majors. UCCS will also offer a modified class using this instrument for science and engineering majors, providing them with the training necessary for their future careers in the local nanotechnology and biomedical industries. The research activities using this instrument will include programs leading to, for example: development of faster and smaller nano-electronic devices used in communications, development of better materials for computer memories, and investigation of liquid crystals for displays (LCD's).