MRI: Development of a Spin-Polarized Scanning Tunneling Microscope for Nanomagnetism Studies

MRI：开发用于纳米磁性研究的自旋偏振扫描隧道显微镜

• 批准号: 0923231
• 负责人: Alex de Lozanne
• 金额: $ 48.3万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-10-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0923231&HistoricalAwards=false
• 关键词: MRI; Development; Spin; Polarized; Scanning

0923231de LozanneU. Texas Austin"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."Technical Summary: The development of a low temperature scanning tunneling microscope with spin-polarized and spectroscopic capabilities is proposed (SP-STM). While a handful of similar instruments are operating in Europe and Japan, so far there are only two in the US. The proposed instrument will have three features that are designed to increase its productivity compared to existing facilities: the tip will be characterized with in-situ field ion microscopy, in-situ scanning electron microscopy, and with a secondary in-situ room temperature STM. The new instrument will have a superconducting magnet to provide sufficient field to manipulate the magnetic moment of the tip and the sample. This instrument will benefit the research programs of 12 faculty on our campus and will strengthen existing collaborations amongst this group and with researchers world-wide. The initial experiments will include studies of multiferroic and manganite materials. This is timely since a new MBE facility for oxide growth has just arrived. We will also study the behavior of triangular arrays of self-assembled magnetic nanoplatelets, which is a promising realization of the elusive frustrated Ising model. Spin-torque effects will be studied and used to manipulate the magnetization of individual nanoplatelets. All these studies will be complemented by existing capabilities in low temperature magnetic force microscopy and Hall Probe microscopy. The PI?s are already committed to the training of a diverse community of scientists, both individually as well as collectively through their participation in programs such as REU, IGERT, and outreach to High Schools.Layman Summary: "The nation that controls magnetism will control the universe," predicted Dick Tracy, the comic book hero debuted in 1931. The creator of this character would probably not believe to what extent this has become a reality: most of our financial, medical, and government records are now stored on magnetic media with ever increasing information density. While information storage technology has already benefitted from basic discoveries made in the past decade or two, the most recent developments are even more impressive, such as the detection of the magnetic spin of a single electron. The scanning tunneling microscope, known for its ability to image atoms on surfaces, is blind to the magnetic properties of the sample. Fortunately this microscope can be fitted with spin-polarized ?glasses? that allow us to look at the magnetic landscape at the atomic scale. Unfortunately this is not easy, and European labs have taken the lead in this important technique. Only two labs in the US have developed spin-sensitive tunneling microscopes. The PI and his group have developed similar microscopes for 27 years and propose to use their expertise to build a new generation of spin-sensitive microscopes that can make this powerful technique more widely available in the US. The team that will work on this is unusually diverse, because half of the doctoral students are female and more than half of the team is Hispanic. During the summer the team also has a few high school students, with strong emphasis on the participation of young women.

0923231DE lozanneu。得克萨斯州奥斯汀“该奖项是根据2009年《美国回收与再投资法》（公法111-5）资助的。 虽然少数类似的工具在欧洲和日本运行，但到目前为止，在美国只有两种。 所提出的仪器将具有三个旨在提高其生产率的特征，与现有设施相比：尖端将以原位场离子显微镜，原位扫描电子显微镜以及二次室内室温STM进行表征。 新仪器将具有超导磁铁，以提供足够的场来操纵尖端和样品的磁矩。 该工具将使我们校园中的12位教师的研究计划受益，并将加强该小组和全球研究人员之间的现有合作。 最初的实验将包括对多效和锰矿材料的研究。 这是及时的，因为新的MBE氧化物增长设施刚刚到来。 我们还将研究自组装磁性纳米片的三角形阵列的行为，这是难以捉摸的沮丧的Ising模型的有希望的实现。 将研究自旋扭伤效应并用来操纵单个纳米片的磁化。 在低温磁力显微镜和霍尔探针显微镜中，现有能力将得到所有这些研究的补充。 PIS已经致力于对多元化的科学家社区进行培训，无论是通过他们参与诸如REU，IGERT和向高中宣传等计划的参与而共同致力于培训。现在，政府记录存储在磁媒体上，信息密度不断增加。 尽管信息存储技术已经从过去十年或两年中的基本发现中受益，但最新的发展更加令人印象深刻，例如检测单个电子的磁性旋转。 扫描隧道显微镜以其在表面上图像原子的能力而闻名，对样品的磁性视而不见。 幸运的是，该显微镜可以配备自旋偏振？玻璃杯吗？这使我们能够在原子量表上查看磁性景观。 不幸的是，这并不容易，欧洲实验室在这一重要技术中占据了领先地位。 美国只有两个实验室开发了自旋敏感的隧道显微镜。 PI和他的小组已经开发了相似的显微镜已有27年了，并建议利用其专业知识来建立新一代的自旋敏感显微镜，这些显微镜可以使这种强大的技术在美国更广泛地使用。 将在此工作的团队异常多样，因为一半的博士生是女性，而一半以上的团队是西班牙裔。 在夏季，该团队还有一些高中生，非常重视年轻女性的参与。