Chiral Coupling to Magnetodipolar Radiation

TL;DR

This paper reviews and extends the theory of chiral spin wave excitation by magnetodipolar fields, demonstrating unidirectional spin currents and asymmetric magnon densities through two experimental setups involving magnetic films.

Contribution

It provides a comprehensive theoretical framework for chiral pumping of spin waves and illustrates physical principles with two experimental configurations.

Findings

Chiral pumping leads to unidirectional spin currents.

Asymmetric magnon densities are generated by magnetodipolar stray fields.

The theory is validated through two experimental examples.

Abstract

We review and extend the theory of chiral pumping of spin waves by magnetodipolar stray fields that generate unidirectional spin currents and asymmetric magnon densities. We illustrate the physical principles by two kinds of chiral excitations of magnetic films, i.e., by the evanescent Oersted field of a narrow metallic stripline with an AC current bias and a magnetic nanowire under ferromagnetic resonance.