thermoremanent magnetization

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ther·mo·rem·a·nent magnetization

The magnetization that an igneous rock acquires, usually from the magnetic field in which it is located, when the temperature of the magma or lava from which it forms falls below the Curie point during the cooling and solidification process.
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References in periodicals archive ?
Neel, "Thermoremanent magnetization of fine powders," Review of Modern Physics, vol.
Geophysicists have long used this leftover magnetization, called thermoremanent magnetization (TRM), as a tool to trace changes in the earth's magnetic field and as a yardstick to measure the drift of the continents.