Experiments to Investigate the Demagnetization Response of Small Single Particles

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磁粒子的理解仍然非常不完整。然而，这些细颗粒的行为可以为破译岩石中NRM（自然剩余磁化）的起源以及NRM载体的晶粒尺寸和畴态提供诊断工具。这些工具在解释古生代和更古老的岩石的古地磁方面特别有用，这些岩石漫长而复杂的历史增加了它们原始磁化被重置的可能性。一系列的实验将研究控制携带不同类型剩余物的单个粒子的AF退磁响应的物理基础。虽然以前的工作人员在这类研究中利用了粒子的组合，但单个粒子比组合有几个优点。主要优点是，在单个粒子中，AF响应可以直接与观察到的畴结构变化和观察到的微观结构联系起来。＊＊＊

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. ***