FMR (Ferromagnetic Resonance) is a powerful tool to study the magnetic properties of materials. For spin-orbit torque (SOT) applications, the FMR data can be used to determine the key parameters such as the damping constant and the effective field of the magnetic layers. The information can be used to optimize the materials and the structure for better SOT performance.
Some books and articles that could be useful in understanding the interpretation of FMR data for SOT are:
"Spin orbitronics" by Sinova et al. (2015)
"Spin orbit torque-based magnetic memory and logic" by L. Liu et al. (2012)
"Spin Hall effect in metallic ferromagnets" by M. D. Stiles and A. Zangwill (2006)
These resources provide a good foundation for understanding FMR and its application in the study of SOT.