Experiments to Investigate the Demagnetization Response of Small Single Particles

9418405哈尔格达尔尽管古地磁学取得了巨大的成功，但我们对携带古地磁记录的细小磁性粒子的了解仍然非常不完整。然而，这些细小颗粒的行为可以为破译岩石中自然剩余磁化(NRM)的来源以及NRM载体的颗粒大小和磁化状态提供诊断工具。这类工具在解释古生代和更老岩石的古地磁方面将特别有用，因为它们漫长而复杂的历史增加了其原始磁化被重置的可能性。一系列实验将研究控制携带不同类型剩磁的单个粒子的AF退磁响应的物理基础。尽管以前的工作人员在这类研究中利用了颗粒的组合，但单个颗粒比组合有几个优点。其主要优点是，在单个粒子中，AF响应可以直接与观察到的磁畴结构的变化和观察到的微结构联系在一起。***

9418405 Halgedahl Despite the great success of paleomagnetism, our understanding of the fine magnetic particles that carry the paleomagnetic record is still remarkably incomplete. Yet the behavior of these fine particles could provide diagnostic tools for deciphering the origin of NRM (natural remanent magnetization) in rocks, as well as the grain sizes and domain states of the NRM carriers. Such tools would be especially useful in interpreting the paleomagnetism of Paleozoic and older rocks, whose long and complex histories increase the probability that their original magnetizations were reset. A series of experiments will investigate the physical bases that govern AF demagnetization response of single particles carrying different types of remanences. Although previous workers have utilized assemblages of particles in such studies, single particles have several advantages over assemblages. The principal advantage is that, in a single particle, AF response can be directly linked to observed changes of domain structure and to observed microstructure. ***