Néel relaxation theory
From Wikipedia, the free encyclopedia
Néel relaxation theory is a theory developed by Louis Néel in 1949[1] to explain time-dependent magnetic phenomena known as magnetic viscosity[clarification needed]. It is also called Néel-Arrhenius theory, after the Arrhenius equation, and Néel-Brown theory after a more rigorous derivation by William Fuller Brown, Jr.[2] Néel used his theory to develop a model of thermoremanent magnetization in single-domain ferromagnetic minerals that explained how these minerals could reliably record the geomagnetic field. He also modeled frequency-dependent susceptibility and alternating field demagnetization.