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The heating of iron ammonium alum by alternating magnetic fields at very low temperatures

Published online by Cambridge University Press:  24 October 2008

E. S. Shire  and
H. M. Barkla
E. S. Shire
Affiliation:
Cavendish LaboratoryCambridge
H. M. Barkla
Affiliation:
Cavendish LaboratoryCambridge
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Extract

The irreversible heating of iron ammonium alum by an alternating field is shown to be proportional to the frequency of the field. The heating is therefore similar to that arising from hysteresis in ferromagnetics, but no remanence could be found by a ballistic method at the lowest temperature obtained, about 0·075° K. The rate of heating was much increased by the superposition of a steady magnetic field of a few hundred gauss.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 35 , Issue 2 , April 1939 , pp. 327 - 335
Copyright
Copyright © Cambridge Philosophical Society 1939

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References

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