Fig. 3: Comparison with light absorption.
From: Optical spin-orbit torque in heavy metal-ferromagnet heterostructures
a The amount of measured optical spin–orbit torque in the sap/Co(dCo)/Pt(2) structure (black squares). Dashed lines are fittings with light absorption in Pt (black line) and in Co (red line). For the fitting, we use a quantum efficiency (η) of 0.045 and 0.008 in Eq. (1) for black and red lines, respectively. Inset shows the calculation of light absorption (abs) of Pt (black line), Co (red line), and Co+Pt (blue line) in the sap/Co(dCo)/Pt(2) structure (light is incident on the sapphire substrate side). The calculation is done with refractive indexes of each layer and initial light energy of one.
