The orbital moment and field-like torque driven by the inverse Faraday effect in metallic ferromagnets

Abstract

The inverse Faraday effect was initially discovered with dielectric paramagnets and recently extended to metallic ferromagnets, and it has been considered as one of the key mechanisms for the optical manipulation of the magnetization. Two different experimental observations were attributed to the inverse Faraday effect: induced magnetic moment and torque on the magnetization. In this work, we measure the induced orbital moment and field-like torque driven by the inverse Faraday effect in metallic ferromagnets of Co and show a relationship between them. We investigate the thickness and wavelength dependence of the induced orbital moment and field-like torque and compare them with theories.