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• W2586207875 abstract "In this thesis electron and spin transport are investigated on sub-picosecond timescales. This is done by measuring the influence of transport on the demagnetization of a magnetic material after heating by a short laser pulse. Two different effects have been examined. First, it was investigated whether spin transport can have a large influence on the laser-induced demagnetization of a ferromagnetic thin film, which has been proposed recently. This is done by measuring the demagnetization of a nickel thin film placed on both a conducting and an insulating substrate. We have shown that the measurements can not be explained by spin transport, and that processes that locally dissipate spin momentum are therefore dominant. No signs of spin transport have been found in nickel, although due to the uncertainty of the measurements a small influence of spin transport on the magnetization dynamics can not be excluded. The second part of this thesis focusses on the control of heat transport by using a so-called spin-valve geometry. The heat conduction of such a spin-valve can be altered using a magnetic field. The demagnetization of a magnetic layer placed on top of the spin-valve was then measured, and it has been unambiguously shown that the demagnetization is affected by this change in heat conduction. With this a proof of concept has been provided for the control of ultrafast heat transport. Furthermore, simulations were done on the device using different models to describe heat transport. These simulations show that the size of the measured effect approximately corresponds to expectations." @default.
• W2586207875 created "2017-02-17" @default.
• W2586207875 creator A5042064889 @default.
• W2586207875 date "2013-01-01" @default.
• W2586207875 modified "2023-09-27" @default.
• W2586207875 title "Ultrafast spin and heat transport after femtosecond pulsed laser excitation in metals" @default.
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