Detection of noninteracting single domain particles using first-order reversal curve diagrams
Detection of noninteracting single domain particles using first-order reversal curve diagrams
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DOI：
10.1029/2009gc002916
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发表时间：
2010-01-27
影响因子：
3.5
通讯作者：
Horng, Chorng-Shern
中科院分区：
文献类型：
--
作者：
Egli, Ramon;Chen, Amy P.;Horng, Chorng-Shern
我们提出了一种高度灵敏和准确的方法，用于定量检测和表征岩石和沉积物中非相互作用或弱相互作用的单轴单域颗粒（UNISD）。该方法基于一阶反转曲线 (FORC) 的高分辨率测量。 UNISD 颗粒具有独特的 FORC 特征，可用于隔离它们在其他磁性成分中的贡献。该特征沿着 FORC 图的 H-c 轴有一个狭窄的脊，称为中心脊，它与粒子的切换场分布成正比。因此，中心脊可以直接与其他磁性测量（例如剩磁曲线）进行比较，其优点是对 SD 颗粒而不是其他磁性成分具有完全选择性。这种选择性是其他磁分离方法无法比拟的，并提供了有用的应用，从用于古强度研究的 SD 颗粒表征到检测沉积物中的磁化石和超细自生沉淀矿物。
We present a highly sensitive and accurate method for quantitative detection and characterization of noninteracting or weakly interacting uniaxial single domain particles (UNISD) in rocks and sediments. The method is based on high-resolution measurements of first-order reversal curves (FORCs). UNISD particles have a unique FORC signature that can be used to isolate their contribution among other magnetic components. This signature has a narrow ridge along the H-c axis of the FORC diagram, called the central ridge, which is proportional to the switching field distribution of the particles. Therefore, the central ridge is directly comparable with other magnetic measurements, such as remanent magnetization curves, with the advantage of being fully selective to SD particles, rather than other magnetic components. This selectivity is unmatched by other magnetic unmixing methods, and offers useful applications ranging from characterization of SD particles for paleointensity studies to detecting magnetofossils and ultrafine authigenically precipitated minerals in sediments.