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Time evolution of electron structure in femtosecond heated warm dense molybdenum
Dorchies, F.,Recoules, V.,Bouchet, J.,Fourment, C.,Leguay, P. M.,Cho, B. I.,Engelhorn, K.,Nakatsutsumi, M.,Ozkan, C.,Tschentscher, T.,Harmand, M.,Toleikis, S.,Stö,rmer, M.,Galtier, E.,Lee, H. J.,N American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.92 No.14
Observation of Reverse Saturable Absorption of an X-ray Laser
Cho, B. I.,Cho, M. S.,Kim, M.,Chung, H.-K.,Barbrel, B.,Engelhorn, K.,Burian, T.,Chalupský,, J.,Ciricosta, O.,Dakovski, G. L.,Há,jková,, V.,Holmes, M.,Juha, L.,Krzywinski, J.,Lee, R. American Physical Society 2017 Physical Review Letters Vol.119 No.7
Opachich, Y P,Comin, A,Bartelt, A F,Young, A T,Scholl, A,Feng, J,Schmalhorst, J,Shin, H J,Engelhorn, K,Risbud, S H,Reiss, G,Padmore, H A IOP Pub 2010 Journal of Physics, Condensed Matter Vol.22 No.15
<P>The demagnetization dynamics of the Heusler alloy Co<SUB>2</SUB>MnSi was studied using picosecond time-resolved x-ray magnetic circular dichroism. The sample was excited using femtosecond laser pulses. In contrast to the sub-picosecond demagnetization of the metal ferromagnet Ni, substantially slower demagnetization with a time constant of 3.5 ± 0.5 ps was measured. This could be explained by a spin-dependent band gap inhibiting the spin-flip scattering of hot electrons in Co<SUB>2</SUB>MnSi, which is predicted to be half-metallic. A universal demagnetization time constant was measured across a range of pump power levels. </P>