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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>