Femtosecond demagnetization of ferromagnetic CoPt3 thin films and Ni nanoparticles
We have studied the spin dynamics in CoPt3 thin films and Ni nanoparticles. It is shown that a ferro-paramagnetic transition can be induced in a few hundreds of femtoseconds. In addition, the spin relaxation in the nanoparticles displays a super-paramagnetic behavior.
KeywordsPump Pulse Spin Relaxation Spin Dynamic Coulomb Exchange Probe Wavelength
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