Understanding fine magnetic particle systems through use of first-order reversal curve diagrams
Авторы: Roberts A., Heslop D., Xiang Zhao, Pike Ch.
Reviews of Geophysics
First-order reversal curve (FORC) diagrams are constructed from a class of partial magnetic
hysteresis loops known as first-order reversal curves and are used to understand magnetization processes in
fine magnetic particle systems. A wide-ranging literature that is pertinent to interpretation of FORC diagrams
has been published in the geophysical and solid-state physics literature over the past 15 years and is summarized
in this review. We discuss practicalities related to optimization of FORC measurements and important issues
relating to the calculation, presentation, statistical significance, and interpretation of FORC diagrams. We also
outline a framework for interpreting the magnetic behavior of magnetostatically noninteracting and interacting
single domain, superparamagnetic, multidomain, single vortex, and pseudosingle domain particle systems.
These types of magnetic behavior are illustrated mainly with geological examples relevant to paleomagnetism,
rock magnetism, and environmental magnetism. These technical, experimental, and interpretational
considerations are relevant to applications that range from improving particulate media for magnetic recording
in materials science, to providing a foundation for understanding geomagnetic recording by rocks in
geophysics, to interpreting depositional, microbiological, and environmental processes in sediments.