Comparative Study of Femtosecond Laser-Induced Ultrafast Magnetization Dynamics in Soft Ferromagnetic Ultra-thin alloy

The typical demagnetization mechanism is applicable in magneto-optic recording systems on a nanoseconds timescale. To develop data processing speed in communication systems and the recording industry, much faster magnetization dynamics must occur on a timescale of femtosecond. Interest in this area has expanded rapidly since understanding the physics of ultrafast magnetization processes by experiment are an acutely challenging task. As a result, in order to explain the quenching of magnetization by laser heating in ferromagnetic alloys such as permalloy thin film with thickness varying from 1 nm to 5 nm, we executed a new theoretical study. In particular, we demonstrate that the magnetization decays in a timescale of picoseconds by the microscopic three-temperature model.