Theoretical and Experimental Investigation of Low-temperature Magnetic Phase Transitions and Application to Paleomagnetism

9814396低温磁测量越来越多地用于岩石磁学的应用，以研究板块构造，地球磁场的历史和全球环境变化。 这些测量利用了某些磁性矿物在室温以下发生的相变。 研究人员将开发第一个定量理论的变化，剩磁在相变。 理论工作将对赝单畴剩磁和获得热剩磁磁化的可能机制施加强有力的约束。 结合理论和实验工作，研究人员将使用低温退磁来改善古强度测量，并提供古生代碳酸盐岩重磁化的物理解释。

9814396 Tauxe Low-temperature magnetic measurements are increasingly used in applications of rock magnetism to studies of plate tectonics, the history of the Earth's magnetic field and global environmental change. These measurements make use of phase transitions that occur below room temperature in some magnetic minerals. The investigators will develop the first quantitative theory for changes in magnetic remanence across phase transitions. The theoretical work will place strong constraints on possible mechanisms for pseudo-single-domain remanence and acquisition of thermoremanent magnetization. Combining theoretical and experimental work, the investigators will use low temperature demagnetization to improve paleointensity measurements and provide a physical interpretation of remagnetization in Paleozoic carbonates.