We investigate the role of Pt on the magnetization dynamics of Pt/Co2FeAl0.5Si0.5/MgO with perpendicular magnetic anisotropy using the time resolved magneto-optic Kerr effect. Pt/Co2FeAl0.5Si0.5/MgO shows ultrafast magnetization dynamics comparable to 3d ferromagnets and can be fully demagnetized. The demagnetization time τd ∼ 0.27 ps and magnetic heat capacity are independent of the Pt underlayer, whereas the value of the electron-phonon coupling time τe ∼ 0.77 ps depends on the presence of the Pt layer. We further measure the effective damping αeff ∼ 1 that does not scale as the inverse demagnetization time (1/τd), but is strongly affected by the Pt layer.
The role of Pt underlayer on the magnetization dynamics of perpendicular magnetic anisotropy Pt/Co2FeAl0.5Si0.5/MgO
Jean Besbas, Li Ming Loong, Yang Wu, Hyunsoo Yang; The role of Pt underlayer on the magnetization dynamics of perpendicular magnetic anisotropy Pt/Co2FeAl0.5Si0.5/MgO. Appl. Phys. Lett. 6 June 2016; 108 (23): 232408. https://doi.org/10.1063/1.4953587
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