CAREER: Magnetic Bubble Dynamics in Nanodisks with Perpendicular Magnetic Anisotropy

职业：具有垂直磁各向异性的纳米盘中的磁泡动力学

• 批准号: 1053854
• 负责人: Xuemei Cheng
• 金额: $ 50万
• 依托单位: Bryn Mawr College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-06-01 至 2017-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1053854&HistoricalAwards=false
• 关键词: CAREER; Magnetic; Bubble; Dynamics; Nanodisks

****NON-TECHNICAL ABSTRACT****This award supports experimental nanomagnetism research at a women's liberal arts college with a small co-educational Ph.D. program. Nanomagnetism is a particularly exciting area of research due to its fundamental role in physics as well as its potential technological applications. The development of advanced nanotechnology enables the manipulation of materials at the nanoscale to realize new functionality. The research proposed here is to design, fabricate and study novel magnetic nanodisks with perpendicular magnetic anisotropy. This will be accomplished by employing the most advance tools of experimental science: nanofabrication, high-resolution magnetic imaging, time-resolved synchrotron x-ray imaging with high temporal and spatial resolutions, and micromagnetic simulations. This research is expected to provide a new understanding of spin dynamics in nanomagnets, shed light on a variety of fundamental physics topics in nanomagnetism, and widen the scope for dynamical experiments in nanomagnets. This project will also provide undergraduate and graduate students an in-depth research experience and supportive mentoring. In addition, the PI will develop an interdisciplinary nanoscience course and an interactive website to educate the public about the achievements of young women scientists. ****TECHNICAL ABSTRACT****This award supports experimental nanomagnetism research at a women's liberal arts college with a small co-educational Ph.D. program. The research proposed here is to study magnetic bubble dynamics in nanodisks with perpendicular magnetic anisotropy (PMA). The magnetic bubble state, a stable bi-domain configuration existing in nanodisks with PMA, consists of a circular domain wall that separates the nanodisk into two magnetic domains of opposite out-of-plane magnetizations. The nontrivial topological structure in the magnetic bubble is expected to result in novel spin dynamics with potentially new technological applications. To probe the magnetic bubble dynamics, time-resolved photoemission electron microscopy (TR-PEEM) with a 90 ps time resolution and 100 nm spatial resolution will be used. The unique motion of a ground-state magnetic bubble and the switching between the ground and excited states of the bubbles will be investigated. The non-linear spin dynamics in the excited bubble state and current-induced bubble dynamics will also be explored with the intent of developing a magnetic bubble-based spintronic device. This project will also provide undergraduate and graduate students an in-depth research experience and supportive mentoring. In addition, the PI will develop an interdisciplinary nanoscience course and an interactive website to educate the public about the achievements of young women scientists.

* 非技术摘要 * 该奖项支持女子文理学院的实验纳米磁性研究，并提供小型男女同校博士学位。程序.纳米磁学是一个特别令人兴奋的研究领域，因为它在物理学中的基础作用以及潜在的技术应用。 先进的纳米技术的发展使材料在纳米尺度上的操作能够实现新的功能。 本研究旨在设计、制备和研究具有垂直磁各向异性的新型磁性纳米盘。这将通过采用最先进的实验科学工具来实现：纳米纤维，高分辨率磁成像，具有高时间和空间分辨率的时间分辨同步加速器X射线成像，以及微磁模拟。这项研究预计将提供一个新的理解在纳米磁体的自旋动力学，揭示了各种基本的物理主题在纳米磁学，并扩大了范围在纳米磁体的动力学实验。该项目还将为本科生和研究生提供深入的研究经验和支持性指导。此外，PI将开发一个跨学科的纳米科学课程和一个互动网站，教育公众了解年轻女科学家的成就。* 技术摘要 * 该奖项支持女子文理学院的实验性纳米磁性研究，并提供小型男女同校博士学位。程序.本论文主要研究垂直磁各向异性纳米盘中磁泡的动力学行为。 磁泡状态是存在于具有PMA的纳米盘中的稳定的双畴配置，其由将纳米盘分成两个具有相反的面外磁化的磁畴的圆形畴壁组成。 磁泡中的非平凡拓扑结构有望导致新的自旋动力学，具有潜在的新技术应用。为了探测磁泡动力学，将使用具有90 ps时间分辨率和100 nm空间分辨率的时间分辨光电发射电子显微镜（TR-PEEM）。我们将研究基态磁泡的独特运动以及磁泡基态和激发态之间的转换。 还将探索激发气泡态的非线性自旋动力学和电流诱导的气泡动力学，以期开发基于磁泡的自旋电子器件。该项目还将为本科生和研究生提供深入的研究经验和支持性指导。此外，PI将开发一个跨学科的纳米科学课程和一个互动网站，教育公众了解年轻女科学家的成就。