Thermal Casimir Force between Magnetic Materials

TL;DR

This paper studies how magnetic properties of ferromagnets affect the Casimir force between plates at nonzero temperature, highlighting the role of zero-frequency contributions and potential for Casimir repulsion.

Contribution

It demonstrates that only ferromagnetic magnetic properties influence the Casimir pressure and analyzes conditions for Casimir repulsion based on dielectric models.

Findings

Magnetic properties of ferromagnets affect Casimir pressure.

Zero-frequency Lifshitz term is crucial for magnetic influence.

Casimir repulsion depends on dielectric modeling.

Abstract

We investigate the Casimir pressure between two parallel plates made of magnetic materials at nonzero temperature. It is shown that for real magnetodielectric materials only the magnetic properties of ferromagnets can influence the Casimir pressure. This influence is accomplished through the contribution of the zero-frequency term of the Lifshitz formula. The possibility of the Casimir repulsion through the vacuum gap is analyzed depending on the model used for the description of the dielectric properties of the metal plates.