期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 16, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL099758
关键词
geophysics; micromagnetic modeling; anisotropy of magnetic susceptibility
资金
- NTNU
- Research Council of Norway [245963/F50]
Anisotropy of magnetic susceptibility (AMS) is a commonly used method to assess various geological properties. The study reveals that the behavior and magnetic response of magnetite inclusions vary between single-domain (SD) and multi-domain particles.
Anisotropy of magnetic susceptibility (AMS) is commonly used to assess sedimentation, deformation, tectonics, rock fabric, and texture. Using focused-ion beam nanotomography, we develop a micromagnetic method to investigate the AMS of individual magnetite inclusions in silicates across the transition between single-domain (SD) to multidomain behavior. We calculate individual AMS tensors by modeling the magnetization response of a particle to weak applied fields in three orthogonal directions. The main AMS mode of elongated SD particles is not a homogeneous magnetization rotation, but focused alignment of spins at their edges and tips. In single-vortex particles, vortex displacement is the dominant AMS mode, which focuses the largest magnetization changes in a planar region containing the vortex core, and perpendicular to the direction of vortex motion. In multi-vortex structures a combined motion of all vortex centers can lead to high degrees of anisotropy when some motion patterns are energetically much easier to achieve than others.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据