Time and Temperature Stability of Magnetization- a Study on Magnetite and Titanomagnetite Prepared by the Glass-Ceramic Method

在Asilomar岩石磁性研讨会（9月16日至19日， 1986年，人们一致认为， 影响地磁场的古地磁问题 生成和反转，大陆边缘的构造， 前寒武纪大陆漂移需要我们的 了解时间和温度对 纯磁铁矿和钛磁铁矿的磁化强度。 的材料 合成技术，即玻璃陶瓷法， 尺寸范围从50 nm到100 nm的分散良好的单晶 在非磁性基质材料中的磁性纳米颗粒已经被开发出来。 这些 样品（和其他新合成的样品）将用于研究 外加磁场、温度和内应力对 热粘性磁化的获得和稳定性。 实验将揭示畴壁/应力 通过“失调”或“后效”现象相互作用 对于多畴样品是重要的， 我们已经证明的属性是无法解释的现有 理论 结果也将是相关的最好的和可能的 改进热古强度方法，目前的问题是 相当大的争议。

At the Asilomar Workshop on Rock Magnetism (September 16-19, 1986) it was unanimously agreed that the next generation of paleomagnetic problems which impact on geomagnetic field generation and reversal, tectonics of continental margins and Precambrian continental drift require a major increase in our knowledge of the effects of time and temperature on the magnetization of pure magnetite and titanomagnetite. A materials synthesis technique, the glass-ceramic method, which produces well dispersed single crystals ranging in size from 50 nm to 100 um in a non-magnetic matrix material has been developed. These samples (and other newly synthesized ones) will be used to study the effects of applied field, temperature and internal stress on the acquisition and stability of thermo-viscous magnetization. The experiments will reveal whether domain wall/stress interaction through "disacommodation" or "aftereffect" phenomenon is important for multidomain samples whose thermomagnetic properties we have shown to be not explicable with existing theories. The results will also be relevant to best and possibly improve thermal paleointensity methods, presently a matter of considerable controversy.