Viscosity Mechanisms in Magnetite, II: Physical Origin of Anomalously High Unblocking Temperatures

PI研究了高温下的粘性行为 在1-2微米玻璃陶瓷磁铁矿中。 这些目标 实验已经确定了物理机制， 导致VRM解除阻塞温度显著升高 比传统理论预测的要多 她现在将延长 以前的研究高温粘度，与 以下目标：（1）确定是否存在因果联系 扩散后效与高阻解堵之间 温度，通过结合粘度研究与测量， 在高温下作为时间函数的敏感性， （2）表征粘性行为和畴结构， 温度和初始热/磁状态的函数。

The PI has studied viscous behavior at elevated temperature in 1-2 micron glass-ceramic magnetite. The goal of these experiments has been to identify the physical mechanism that causes VRM unblocking temperatures to be substantially higher than what traditional theories predict. She will now extend the previous studies of high-temperature viscosity, with the following goals: (1) to determine whether there is a causal link between diffusion after-effect and anomalously high unblocking temperatures, by combining viscosity studies with measurements of susceptibility as a function of time at elevated temperatures, and (2) to characterize viscous behavior and domain structure as functions of temperature and initial thermal/magnetic state.