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Updated: Dec 28, 2025

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Published on: July 3, 2015
Ultrafast magnetization dynamics in the vicinity of spin reorientation transition in TbCo2/FeCo heterostructures
Mikhail Gaponov1, Sergei Ovcharenko1, Alexey Klimov1
1MIREA-Russian Technological University 'RTU MIREA', 119454 Moscow, Russia.
Abstract:
The magnetic moment dynamics excited by 35 fs laser pulses in TbCo2/FeCo heterostructure is experimentally investigated by pump-probe technique. The studies are carried out in two typical geometries with magnetizing field perpendicular and along to the easy magnetization axis. In the 'easy axis' orientation, high-frequency oscillations of magnetic moments odd with respect to the sign of the magnetizing field are observed using the magneto-optical Kerr effect. In the perpendicular 'hard axis' orientation corresponding to the spin reorientation phase, the experiment shows oscillations that are even with respect to the field. The maximum angle of Kerr rotation as a function of the magnetizing field strength depicts a specific hysteretic loop that reveals ultrafast optical control of uniaxial magnetic anisotropy originally induced during deposition of the heterostructure in a DC magnetic field. The results provide new ways of ultrafast control of magnetic states in exchange coupled intermetallic heterostructures designed for spintronic applications.
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