Phys. Rev. E 78, 026608 (2008) [5 pages]Can the imaginary part of permeability be negative?Received 25 February 2008; published 18 August 2008 When new composite optical materials are developed experimentally or studied in numerical simulations, it is essential to have a set of fundamental constraints that the optical constants of such materials must satisfy. In this paper I argue that positivity of the imaginary part of the magnetic permeability may not be one of such constraints, particularly in naturally occurring diamagnetics and in artificial materials that exhibit diamagnetic response to low-frequency or static magnetic fields. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.78.026608
DOI:
10.1103/PhysRevE.78.026608
PACS:
41.20.Jb, 75.20.−g, 78.20.−e
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