Properties of Magnetic Viscosity

粘性剩余磁化（VRM）是暴露在环境磁场中不可避免地获得的剩余磁化。在本质上，VRM是由地磁场引起的二次套印。这种VRM在古地磁中通常构成不受欢迎的噪声。尽管它无处不在，但在古地磁解释中仍然存在很大的困难。特别是，随着实验条件的变化，VRM的性质会发生很大的变化。因此，将实验室中个别研究的结果推广到古地磁标本的NRM是危险的。因此，研究人员提出了一种系统的实验和理论方法，旨在使用定义良好的自然和合成样品探索VRM的基本行为。将研究VRM的史前、温度和时间依赖性。他们将监测剩磁矢量的变化以及VRM的退磁特性。此外，实验将在高达300℃的高温下进行，以表征热粘性剩余磁化（trvrm）的特性。鉴于trvrm /VRM在自然界的普遍存在，这些研究将为更完整地描述VRM及其对确定过去地磁场矢量的影响铺平道路。

Viscous remanent magnetization (VRM) is a remanent magnetization that is inexorably acquired during exposure to ambient magnetic fields. In nature, VRM is a secondary overprint resulting from the geomagnetic field. This VRM generally constitutes undesirable noise in paleomagnetism. Despite its ubiquity, VRM still presents great difficulty in paleomagnetic interpretation. In particular, properties of VRM vary substantially as experimental conditions change. As a result, it is dangerous to generalize the outcome of individual investigations in the laboratory to the NRM of paleomagnetic specimens. The investigators therefore propose a systematic experimental and theoretical approach that intends to explore fundamental behavior of VRM using well-defined natural and synthetic samples. Properties of pre-history, temperature, and time-dependence of VRM will be examined. They will monitor changes in the magnetic remanence vector as well as the demagnetization characteristics of VRM. In addition, experiments will be performed at elevated temperatures up to 300C to characterize properties of thermoviscous remanent magnetization (TVRM). Given the prevalence of TVRM/VRM in nature, these investigations will pave the way for a much more complete characterization of VRM and its affects on the determination of past geomagnetic field vectors.