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Cross Section for the Reaction C 12 ( γ , n ) C 11

Cross Section for the Reaction C 12 ( γ , n ) C 11 (Figs. 2a and 2b). The additional magnetization of the ferrite IIB is frequency-dependent, similar to that of ferrite I. Distortion measurements have also been carried out on trans- formers having these ferrite cores. The distortion gradually de- creases with frequency and reaches zero at the frequency where B is a linear function of H. From these results it is concluded that in ferrites with a high permeability, at magnetic field strengths of about He, an additional magnetization process occurs which (a) is frequency-dependent already below the gyromagnetic resonance frequency, (b) takes place at a lower field strength as the density of the ferrite is greater, (c) is irreversible (since Rayleigh's law holds in small fields). The initial permeability and the permeability at high fre- quencies, which is independent of the field strength, are, in our opinion, related to a pure rotational process. In contrast to the magnetization process giving rise to the above-mentioned perme- abilities, the additional process is to be ascribed to irreversible Bloch-wall displacements in the ferrite. These results are contra- dictory to the conclusions reached by Rado et al.,6 that the initial permeability of ferrites is determined by reversible Bloch-wall displacements. A detailed paper on http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

Cross Section for the Reaction C 12 ( γ , n ) C 11

Haslam, R. N; Johns, H. E; Horsley, R. J
Physical Review , Volume 82 (2) – Apr 15, 1951
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1951 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.82.270
Publisher site
See Article on Publisher Site

Abstract

(Figs. 2a and 2b). The additional magnetization of the ferrite IIB is frequency-dependent, similar to that of ferrite I. Distortion measurements have also been carried out on trans- formers having these ferrite cores. The distortion gradually de- creases with frequency and reaches zero at the frequency where B is a linear function of H. From these results it is concluded that in ferrites with a high permeability, at magnetic field strengths of about He, an additional magnetization process occurs which (a) is frequency-dependent already below the gyromagnetic resonance frequency, (b) takes place at a lower field strength as the density of the ferrite is greater, (c) is irreversible (since Rayleigh's law holds in small fields). The initial permeability and the permeability at high fre- quencies, which is independent of the field strength, are, in our opinion, related to a pure rotational process. In contrast to the magnetization process giving rise to the above-mentioned perme- abilities, the additional process is to be ascribed to irreversible Bloch-wall displacements in the ferrite. These results are contra- dictory to the conclusions reached by Rado et al.,6 that the initial permeability of ferrites is determined by reversible Bloch-wall displacements. A detailed paper on

Journal

Physical Review – American Physical Society (APS)

Published: Apr 15, 1951

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