FORC Diagrams: A New Technique for Characterizing The Magnetic Properties of Natural Samples

目前用于研究天然和合成材料磁性能的大多数方法只提供磁性颗粒的平均尺寸信息。研究人员正在开发一种新方法，该方法将实际提供有关磁性颗粒大小分布的信息。这些信息包含在等高线图（称为FORC图）中，等高线图是由一组部分迟滞曲线生成的。初步结果表明，可以使用FORC图来表征范围广泛的样品，并识别和区分具有相同平均晶粒尺寸的不同类型的组合。这个项目的目标是：1)开发一种简单快速的生成FORC图的方法，从而使该方法得到更广泛的应用；2)演示FORC图如何解决使用其他技术无法轻松解决的问题。

Verosub 9909468 Most of the methods currently used for studying the magnetic properties of natural and synthetic materials only provide information about the average size of the magnetic grains. The investigators are developing a new method that will actually provide information about the size distribution of the magnetic grains. This information is contained in contour plots (called FORC diagrams) that are generated from a set of partial hysteresis curves. Preliminary results indicate that it is possible to characterize a wide range of samples using FORC diagrams and to identify and discriminate between the different types of assemblages that have the same average grain size. The goals of this project are 1) to develop a simple and rapid means of producing a FORC diagram so that the method can be more widely used, and 2) to demonstrate how FORC diagrams can solve problems that can not be easily solved using other techniques.