A new method of investigating the discontinuous changes in magnetization (the Barkhausen effect) is described. The number of discontinuities occurring is counted, and a knowledge of the change in magnetic moment associated with each one, leads to information concerning the volume of material associated with a discontinuity. The change in magnetization due to discontinuities and the distribution of number and size over the hysteresis cycle is obtained. Conclusions are drawn that the discontinuities associated with volumes of greater than 0.9×10-9cm3 only account for about 30% of the total change in magnetization. Possible explanations of these results are discussed, and suggestions made as to the further development of the method.
[1]
E. C. Stevenson,et al.
A Vacuum Tube Circuit for Scaling Down Counting Rates
,
1937
.
[2]
R. Bozorth,et al.
Barkhausen Effect. III. Nature of Change of Magnetization in Elementary Domains
,
1932
.
[3]
R. Bozorth,et al.
Barkhausen Effect II. Determination of the Average Size of the Discontinuites in Magnetization
,
1930
.
[4]
R. Bozorth.
Barkhausen Effect in Iron, Nickel and Permalloy. I. Measurement of Discontinuous Change in Magnetization
,
1929
.
[5]
E. Tyndall.
The Barkhausen Effect
,
1924
.
[6]
B. Wwedensky.
Über die Wirbelströme bei der spotanen Änderung der Magnetisierung
,
1921
.