IMR: Development of a Variable Temperature/Variable Magnetic Field Scanning Force Microscope and Student Training

IMR：变温/变磁场扫描力显微镜的开发和学生培训

• 批准号: 0414944
• 负责人: Udo Schwarz
• 金额: $ 16.8万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-09-01 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0414944&HistoricalAwards=false
• 关键词: IMR; Development; Variable; Temperature; Magnetic

We propose the development of a variable temperature, variable magnetic field ultrahigh vacuum scanning force microscope that enables the local measurement of frictional, magnetostatic, and electrostatic forces as a function of temperature (10 K T 300 K) and magnetic field (B 0.1 T). The new instrument will combine well-tested elements together with new design elements that have not been applied to SFM before. The attributes of extremely high resolution and stability, ultrahigh vacuum with in-situ tip and sample preparation, flexibility in temperature from 10 K to room temperature, and magnetic fields up to more than 0.1 T would be unique in the US. Friction has been explored at the nanoscale in the past as a function of the applied load or the sliding velocity, but very little has been done as a function of the temperature due to a lack of suitable equipment. Such experiments will be useful to test current theoretical models of friction, which describe friction as a thermally activated process. To address these questions, we will investigate friction as a function of the temperature, and also measure friction at phase transitions in order to separate phononic and electronic contributions to friction. In this project, we will carry out local imaging of the phase separation between ferromagnetic metallic and charge-ordered insulating clusters that coexist in colossal magnetoresistive (CMR) manganites using electrostatic force microscopy and magnetic force microscopy at variable temperatures and magnetic fields. We will also examine the low field manipulation of phase percolation of epitaxial ferroelectric/CMR heterostructures using an electric field effect approach. In this experiment, we will look to induce metallic conduction at low magnetic fields (hundreds of gauss) by applying small voltages (a few volts). %%%We propose the development of a variable temperature, variable magnetic field ultrahigh vacuum scanning force microscope that enables the local measurement of frictional, magnetostatic, and electrostatic forces as a function of temperature and magnetic field. The new instrument will combine well-tested elements together with new design elements that have not been applied before. The attributes of extremely high resolution and stability, ultrahigh vacuum with in-situ tip and sample preparation, flexibility in temperature, and magnetic fields up to more than 0.1 T would be unique in the US. Friction has been explored at the nanoscale in the past as a function of the applied load or the sliding velocity, but very little has been done as a function of the temperature due to a lack of suitable equipment. Such experiments will be useful to test current theoretical models of friction, which describe friction as a thermally activated process.

我们提出了可变温度，可变磁场超高真空扫描力显微镜的发展，该显微镜可以局部测量摩擦，磁静力和静电力，这是温度（10 K T 300 K）和磁场（B 0.1 T）的函数。新仪器将结合经过良好的元素以及以前未应用于SFM的新设计元素。极高的分辨率和稳定性的属性，具有原位尖端和样品制备的超高真空，从10 K到室温的温度灵活性以及在美国的磁场最高为0.1 t以上是独一无二的。 过去在纳米级探索了摩擦，这是施加的载荷或滑动速度的函数，但由于缺乏合适的设备，由于温度的函数很少。此类实验将有助于测试当前的摩擦理论模型，该模型将摩擦描述为热活化过程。为了解决这些问题，我们将研究摩擦作为温度的函数，并在相变时测量摩擦，以将声音和电子贡献分离出对摩擦的贡献。在该项目中，我们将使用静电力显微镜显微镜和磁力显微镜在可变温度和磁场上在巨磁磁盘（CMR）锰岩中共存的铁磁金属和电荷的绝缘簇之间的相位分离。 我们还将使用电场效应方法检查外延铁电/CMR异质结构的相位渗透的低场操作。 在此实验中，我们将通过施加小电压（几伏）来诱导低磁场（数百个高斯）的金属传导。 %%％我们提出了可变温度，可变磁场超高真空扫描力显微镜的开发，该扫描力显微镜可以局部测量摩擦，磁静力和静电力作为温度和磁场的函数。新仪器将结合经过良好的元素以及以前未应用的新设计元素。非常高的分辨率和稳定性的属性，具有原位尖端和样品制备的超高真空，温度的灵活性以及高达0.1 T的磁场在美国是独一无二的。 过去在纳米级探索了摩擦，这是施加的负载或滑动速度的函数，但由于缺乏合适的设备而导致温度的函数很少。此类实验将有助于测试当前的摩擦理论模型，该模型将摩擦描述为热活化过程。