Structure and property changes and femtosecond laser-induced magnetization dynamics of two-year-old high coercive TbFeCo films

► An uncoated TbFeCo film on glass substrate exposed to air for 2 years was studied. ► The uncoated surface was oxidized at room temperature in 2 years. ► Oxidization of the film causes changes in laser-induced magnetic reversal dynamics. ► The sample's structure and magneto-optical property changes prove a bilayer model. ► The SiO2-coated film can resist oxidization at room temperature for over 2 years.