Abstract
A magnetic diffusion after-effect of considerable magnitude has been found and measured in very dilute solid solutions of carbon in iron. The results are interpreted by Néel's theory. Measurements of the time decrease of the induction allow the determination of the diffusion aftereffect field, which can be separated into the contributions due to the 90° and 180° Bloch walls and for which theory gives a simple expression. The diffusion mechanism can be accurately represented only by introducing a fairly wide range of time constants. A large number of anomalies has been found and interpreted in a.c. fields, but in this case, the quantitative measurements are greatly hindered by hysteresis and eddy currents. It seems that the measurement of the diffusion after-effect field could be used as a very sensitive method for the quantitative determination of dissolved impurities.
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