Ultrafast demagnetization of Co25Ni75/Pt multilayers with perpendicular anisotropy at elevated temperatures
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چکیده
Ultrafast demagnetization has been studied in Si/Pts160 Åd / fCo25Ni75sxd /Pts8 Ådg20 sx=3, 4.5, and 6 Åd multilayers with perpendicular anisotropy by magneto-optical pump-probe measurements in the polar geometry. Time-resolved measurements made in the saturated state showed that maximum demagnetization was achieved within 300 fs. Hysteresis loops were measured at a time delay of 1.3 ps for temperatures from 20 to 300 °C. The Curie temperature was found to increase from 150 to 250 °C with increasing Co25Ni75 thickness. By comparing the loops obtained with and without pump excitation, the increase in electron temperature due to the pump was estimated to be about 60 K. © 2005 American Institute of Physics. fDOI: 10.1063/1.1847991g
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