The Temperature Variation of the Magnetization of Nickel in Low and Moderate Fields

An account is given of measurements on the reversible changes in magnetization accompanying change in temperature in annealed nickel, and the results are discussed in relation to the work of Bates and others on the temperature changes produced by adiabatic changes in magnetization (the magneto-caloric effect). It is found that at relatively high fields, where the magneto-caloric effect is mainly reversible, the results are in good agreement with those obtained from direct magneto-caloric measurements, while for low field values a quantitative separation of the reversible and irreversible components of the magnetocaloric effect has been carried out The result of an analysis of the reversible heating effect is compared with the estimate given in the theoretical investigation of Stoner and Rhodes, and it is suggested that, over the low field range considered, rotational processes predominate.