A study of rotational remanent magnetization

Abstract

Rotational Remanent Magnetization (RRM) occurs when ferromagnetic rock specimens are AF demagnetized while rotating slowly. An extensive study of the properties of this remanence has been made in an attempt to determine its formation mechanism. Experiments on good conductors and soft magnetic materials rotating in steady magnetic fields show no corresponding magnetic effects. It is also shown that RRM is not an inertial effect and cannot be produced during thermal magnetization. A comparison of the AF demagnetization curves of RRM with those of other remanences is described, which shows that RRM differs from ARM. RRM has now been confirmed in three different laboratories.