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Statements

Subject Item
dbr:Thermoremanent_magnetization
rdfs:label
Thermoremanent magnetization Rémanence thermomagnétique
rdfs:comment
When an igneous rock cools, it acquires a thermoremanent magnetization (TRM) from the Earth's field. TRM can be much larger than it would be if exposed to the same field at room temperature (see isothermal remanence). This remanence can also be very stable, lasting without significant change for millions of years. TRM is the main reason that paleomagnetists are able to deduce the direction and magnitude of the ancient Earth's field. La rémanence thermomagnétique désigne l’enregistrement d’un champ magnétique par un matériau lorsque celui-ci se refroidit et passe d’une température supérieure à une température inférieure à son point de Curie. Lors de cette transition, les moments magnétiques des atomes qui composent le matériau s’alignent pour créer un dipôle magnétique.
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dbc:Rock_magnetism dbc:Geomagnetism dbc:Ferromagnetism
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When an igneous rock cools, it acquires a thermoremanent magnetization (TRM) from the Earth's field. TRM can be much larger than it would be if exposed to the same field at room temperature (see isothermal remanence). This remanence can also be very stable, lasting without significant change for millions of years. TRM is the main reason that paleomagnetists are able to deduce the direction and magnitude of the ancient Earth's field. La rémanence thermomagnétique désigne l’enregistrement d’un champ magnétique par un matériau lorsque celui-ci se refroidit et passe d’une température supérieure à une température inférieure à son point de Curie. Lors de cette transition, les moments magnétiques des atomes qui composent le matériau s’alignent pour créer un dipôle magnétique.
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wikipedia-en:Thermoremanent_magnetization