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Perpendicular magnetic anisotropy and magnetization process of ferrimagnetic CoFeB/Tb multilayer films

The perpendicular magnetic anisotropy (PMA) and dynamic magnetization reversal process of Tb/CoFeB multilayers have been investigated. The PMA was established near the magnetization compensation point by the antiferromagnetic coupling between Tb and CoFeB layers. By controlling the repetition n of multilayers of CoFeB/Tb, the PMA can be optimized accompanying the change of domain structure due to the different pinning. CoFeB/Tb ferrimagnetic multilayers with PMA could be used to improve spin–orbit torque efficiency and velocity of domain wall motion in spintronic devices.