Abstract
Arising from: D. B. Strukov, G. S. Snider, D. R. Stewart & R. S. Williams Nature 453, 80–83 (2008)10.1038/nature06932
In 1971, Chua suggested1 that there should in principle exist a circuit element linking electrical charge, q, and magnetic flux, ϕ. Strukov et al.2 claim recently to have found such a link. However, here I point out that Chua’s suggestion was in fact preceded by experimental evidence3,4,5 for magneto-electric effects whereby magnetic and electrical signals are interconverted. When the stimulus is magnetic and the response is electrical, the linear magneto-electric coupling constant5, α, is typically reported as dP/dH, where P represents the electrical polarization and H represents the applied magnetic field. The coupling constant could equally be presented as dq/dϕ if divided by the permeability of free space.
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References
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Mathur, N. The fourth circuit element. Nature 455, E13 (2008). https://doi.org/10.1038/nature07437
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DOI: https://doi.org/10.1038/nature07437
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