Departmental Papers (BE)

Document Type

Journal Article

Date of this Version



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.


Suggested Citation:
Markel, V.A. (2008). "Can the imaginary part of permeability be negative?" Physical Review E. 78, 026608.

© 2008 The American Physical Society



Date Posted: 11 January 2011

This document has been peer reviewed.