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

我们提出了一种可变温度，可变磁场的MEMS真空扫描力显微镜，使局部测量的摩擦，静磁场和静电力的温度（10 K）的函数的发展 不 300 K）和磁场（B 0.1 T）。新的仪器将结合联合收割机良好的测试元素与新的设计元素，没有被应用到可持续森林管理之前。极高的分辨率和稳定性，具有原位尖端和样品制备的超真空，从10 K到室温的温度灵活性，以及高达0.1 T以上的磁场等属性在美国是独一无二的。 在过去，已经在纳米尺度上探索了摩擦作为施加的载荷或滑动速度的函数，但是由于缺乏合适的设备，作为温度的函数所做的很少。这些实验将有助于检验目前的摩擦理论模型，这些模型将摩擦描述为热激活过程。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，以分离声子和电子对摩擦的贡献。在这个项目中，我们将进行局部成像的铁磁金属和电荷有序绝缘集群共存于巨磁阻（CMR）锰氧化物之间的相分离，使用静电力显微镜和磁力显微镜在可变的温度和磁场。 我们还将研究低场操作的相渗透的外延铁电/CMR异质结构使用电场效应的方法。 在这个实验中，我们将通过施加小电压（几伏）在低磁场（数百高斯）下诱导金属导电。%我们提出了一个可变的温度，可变磁场的发展，使局部测量的摩擦力，静磁力，静电力作为温度和磁场的函数的真空扫描力显微镜。新的文书将把久经考验的要素与以前没有应用过的新设计要素结合起来。极高的分辨率和稳定性，具有原位尖端和样品制备的高真空，温度灵活性以及高达0.1 T以上的磁场等属性在美国是独一无二的。 在过去，已经在纳米尺度上探索了摩擦作为施加的载荷或滑动速度的函数，但是由于缺乏合适的设备，作为温度的函数所做的很少。这些实验将有助于检验目前的摩擦理论模型，这些模型将摩擦描述为热激活过程。

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.