Torque magnetometry of perpendicular anisotropy exchange-spring heterostructures

The field-induced magnetic configurations in a [Co/Pd]15 /TbFeCo exchange-spring system with perpendicular magnetic anisotropy are studied using torque magnetometry. The experimental results are compared to a 1D micromagnetic simulation. The good agreement between experiments and simulations allows us to deduce the evolution of the in-depth magnetic configuration as a function of the applied field orientation and amplitude. The chirality transition of the interfacial domain wall developing in the structure can also be determined with this technique.