Micromagnetic Determination of the FORC Response of Paleomagnetically Significant Magnetite Assemblages

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geochemistry Geophysics Geosystems Pub Date : 2024-07-25 DOI:10.1029/2024GC011465
Lesleis Nagy, Roberto Moreno, Adrian R. Muxworthy, Wyn Williams, Greig A. Paterson, Lisa Tauxe, Miguel A. Valdez-Grijalva
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Abstract

Micromagnetic modeling allows the systematic study of the effects of particle size and shape on the first-order reversal curve (FORC) magnetic hysteresis response for magnetite particles in the single-domain (SD) and pseudo-single domain (PSD) particle size range. The interpretation of FORCs, though widely used, has been highly subjective. Here, we use micromagnetics to model randomly oriented distributions of particles to allow more physically meaningful interpretations. We show that one commonly found type of PSD particle—namely the single vortex (SV) particle—has far more complex signals than SD particles, with multiple peaks and troughs in the FORC distribution, where the peaks have higher switching fields for larger SV particles. Particles in the SD to SV transition zone have the lowest switching fields. Symmetrical and prolate particles display similar behavior, with distinctive peaks forming near the vertical axis of the FORC diagram. In contrast, highly oblate particles produce “butterfly” structures, suggesting that these are potentially diagnostic of particle morphology. We also consider FORC diagrams for distributions of particle sizes and shapes and produce an online application that users can use to build their own FORC distributions. There is good agreement between the model predictions for distributions of particle sizes and shapes, and the published experimental literature.

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微磁测定古地磁重要磁铁矿集合体的 FORC 响应
通过微磁建模,可以系统地研究粒度和粒形对单域(SD)和伪单域(PSD)粒度范围内磁铁矿颗粒的一阶反转曲线(FORC)磁滞响应的影响。尽管 FORC 被广泛使用,但其解释却非常主观。在这里,我们利用微磁学来模拟随机取向的颗粒分布,从而做出更有意义的物理解释。我们发现,一种常见的 PSD 颗粒--即单涡(SV)颗粒--的信号比 SD 颗粒复杂得多,在 FORC 分布中存在多个峰值和谷值,其中较大的 SV 颗粒的峰值具有更高的开关场。处于 SD 到 SV 过渡区的粒子开关场最低。对称颗粒和扁圆形颗粒的表现类似,在 FORC 图表的垂直轴附近形成明显的峰值。与此相反,高度扁平的粒子会产生 "蝴蝶 "结构,这表明这些结构有可能是粒子形态的诊断结构。我们还考虑了颗粒大小和形状分布的 FORC 图,并制作了一个在线应用程序,用户可以用它来构建自己的 FORC 分布。模型对颗粒大小和形状分布的预测与已发表的实验文献之间有很好的一致性。
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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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