Spontaneous Magnetization — Techniques and Measurements

Abstract

Measurements on the temperature variation of spontaneous magnetization by both the magnetothermal and magnetic methods have hitherto been confined to nickel; the extension of these measurements, calling for greater sensitivity, is discussed. To the direct method devised by Weiss and Forrer has been added a direct current amplifier, which allows a small magnetocaloric rise of temperature to be measured accurately. The original ferromagnetic balance devised by Sucksmith has been improved and now is capable of wider application to measurements of magnetic intensity in fields which are due to either air core coils or electromagnets. The method is not complicated by the presence of any image effect so that measurements of $\frac{d\sigma }{\mathrm{dH}}$ in high fields can be made with considerable precision.