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We have investigated ultrafast quenching of the Tb4f magnetic order inCo74Tb26 alloys, induced by femtosecond hot-electrons pulses. The hot-electronpulses were produced in specific non-magnetic capping layers by infrared fslaser pulses. Our experimental results show that sub-picosecond dynamics ofTb4f magnetic moments can be induced by non-thermal and thermal hot-electrons.We further demonstrate that the demagnetization efficiencies of non-thermal andthermal hot electrons are similar. However, the characteristic demagnetizationtimes show values of 0.35 ps for non-thermal hot-electrons excitations and 1.2ps for thermal hot-electrons excitations. We explain this temporal elongationby the propagation time of thermal hot-electrons through the 15 nm thick CoTbfilm.

Ultrafast hot-electron induced quenching of Tb4f magnetic order