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isothermal remanent magnetization
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isothermal remanent magnetization

physics
Also known as: IRM
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Quick Summary

Isothermal remanent magnetization (IRM) is a type of permanent magnetism that rocks can retain after an external magnetic field is removed. This magnetism is acquired when a magnetic field is applied at a constant temperature, often room temperature.1

Rocks can acquire magnetism through several processes, including thermo-remanent magnetism (TRM) in igneous rocks as they cool, and detrital remanent magnetism (DRM) when magnetic grains align during deposition in sedimentary rocks. Other types include chemical remanent magnetization (CRM) and viscous remanent magnetization (VRM). The study of this remanent magnetism in rocks, known as paleomagnetism, provides crucial information about Earth's past magnetic field, polar wandering, and continental drift.21

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2 Britannica Sources
  1. remanent magnetism
  2. rock - Types of remanent magnetization

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