Related Experiment Video
Updated: Feb 17, 2026
09:43
Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
Published on: November 7, 2017
9.9K
Bulk magnetic domain stability controls paleointensity fidelity.
Greig A Paterson1,2, Adrian R Muxworthy3, Yuhji Yamamoto4
1Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; greig.paterson@mail.iggcas.ac.cn.
Summary
Nonideal magnetic grains in rocks can distort paleomagnetic records. A new bulk domain stability (BDS) analysis quantifies magnetic grain behavior, improving paleointensity accuracy for understanding Earth's magnetic field evolution.
Area of Science:
- Geophysics
- Paleomagnetism
- Rock Magnetism
Background:
- Nonideal magnetic grains in rocks compromise paleomagnetic records, particularly paleointensity measurements crucial for studying Earth's geodynamo.
- Previous efforts to link rock magnetic behavior to paleointensity accuracy have yielded limited quantitative success.
Purpose of the Study:
- To quantify a trend in hysteresis data that characterizes bulk domain stability (BDS) in magnetic grains.
- To establish a quantitative relationship between BDS and paleointensity behavior for improved paleomagnetic record fidelity.
Main Methods:
- Utilized comprehensive rock magnetic and paleointensity data compilations.
- Quantified a stability trend in hysteresis data to define bulk domain stability (BDS).
- Compared BDS trends with paleointensity data from laboratory and historical experiments.
Main Results:
- Identified a pervasive BDS trend in geological and archeological materials used for paleointensity studies.
- Demonstrated a quantitative correlation between lower BDS values and increased inaccuracy in paleointensity results.
- Showed that in-field BDS quantification reflects low-field bulk remanence stability.
Conclusions:
- Bulk domain stability (BDS) analysis provides a powerful quantitative method for preselecting and postanalyzing paleointensity specimens.
- BDS assessment enhances the selection of high-fidelity paleomagnetic recordings.
- Improved paleointensity accuracy via BDS analysis will advance understanding of geodynamo evolution and fundamental Earth science questions.
Related Concept Videos
01:27Magnetic Fields
7.4K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
A magnetic field is defined by the force that a charged particle experiences...
7.4K
01:28Magnetostatic Boundary Conditions
1.7K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.7K
01:31Magnetic Susceptibility and Permeability
2.5K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
2.5K
01:31Ferromagnetism
3.2K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.2K
01:17Magnetic Damping
1.1K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
1.1K
01:19Magnetic Field Lines
5.9K
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
Magnetic field lines follow several hard-and-fast rules:
5.9K