Giant third-order magneto-optical rotation in ferromagnetic EuO

TL;DR

This paper reports a significant third-order nonlinear magneto-optical rotation in EuO films, which is robust against thickness reduction and useful for probing magnetization in ultra-thin magnetic materials.

Contribution

It demonstrates a giant third-order magneto-optical rotation in EuO, highlighting its potential for studying magnetization in ultra-thin and multilayer magnetic structures.

Findings

Observation of large third-order magneto-optical rotation in EuO

Rotation is unaffected by film thickness reduction

Potential application in probing magnetization of thin magnetic films

Abstract

A magnetization-induced rotation in the third-order nonlinear optical response is observed in out-of-plane-magnetized epitaxial EuO films. We discuss the relation of this nonlinear magneto-optical rotation to the linear Faraday rotation. It is allowed in all materials but, in contrast to the linear Faraday rotation, not affected by the reduction of the thickness of the material. Thus, the third-order magneto-optical rotation is particularly suitable for probing the magnetization of functional magnetic materials such as ultra-thin films and multilayers.