Abstract
IT is well known that ferrimagnetic materials become anisotropic upon application of a magnetic field and that consequently the permeability of a magnetically saturated ferrite medium is described by a tensor1: For a positive and negative circularly polarized wave, the tensor is diagonalized, and the effective permeability is a scalar, μ ± k. The real and the imaginary parts of the elements of the tensor have been measured by several workers2,3, using resonance cavities excited with circularly polarized modes. In order to study ferrite itself, it was pointed out by Spencer et al. 3 that it is necessary to determine the intrinsic magnetic quantities μ and k. Because of the radiofrequency demagnetizing fields the values &μtilde; and k̃ derived from the measurements depend on the sample shape. Those intrinsic values are computed from the experimental values using a magnetostatic approximation for the internal field.
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References
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ROBBRECHT, G., VERHAEGHE, J. Measurements of the Permeability Tensor for ‘Ferroxcube’ at 24,000 Mc./s.. Nature 182, 1080 (1958). https://doi.org/10.1038/1821080a0
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DOI: https://doi.org/10.1038/1821080a0
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