Thellier
Thellier refers to a set of paleomagnetic laboratory procedures for determining the absolute intensity of Earth's ancient magnetic field from rocks and archaeological materials. It is named after Claude Thellier, who, with colleagues in the 1960s–1970s, developed a systematic approach to recover paleointensity from thermoremanent magnetization. The method is often used in conjunction with the Thellier–Coe protocol, a widely adopted variant.
In practice, samples with remanent magnetization are subjected to stepwise demagnetization by heating in zero field
Thellier-type approaches have played a central role in paleointensity research, enabling constructions of age-dependent field intensity