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000043182 084__ $$2WoS$$aPhysics, Condensed Matter
000043182 1001_ $$0P:(DE-HGF)0$$aOppeneer, P.$$b0
000043182 245__ $$aUltra-fast demagnetization in Ni: Theory of magneto-optics for non-equilibrium electron distributions
000043182 260__ $$aBristol$$bIOP Publ.$$c2004
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000043182 440_0 $$03703$$aJournal of Physics: Condensed Matter$$v16$$x0953-8984
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000043182 520__ $$aThe sensitivity of the magneto-optical Kerr response to electronic thermalization processes in ultrafast pump-probe experiments is studied by OF evaluating the complex conductivity tensor of Ni for non-equilibrium electron distributions. The electronic structure and optical matrix elements are calculated within density functional theory. To account for the electronic redistributions generated by the intense pump-laser pulse during the initial stages of electronic thermalization, two kinds of model electron distributions are considered which mimic the so-called dichroic bleaching or state-blocking effect. Thus, certain optical transitions which are allowed under equilibrium conditions are not accessible to the probe laser. It is shown that the conductivity tensor and the complex Kerr angle can be modified substantially by the non-equilibrium electron distributions. Moreover, in striking contrast to the case for ordinary equilibrium conditions, the Kerr rotation and ellipticity are no longer proportional to the magnetization of the sample. The Kerr response at ultrashort times can therefore not be taken as a measure of demagnetization.
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000043182 7001_ $$0P:(DE-Juel1)VDB941$$aLiebsch, A.$$b1$$uFZJ
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000043182 8567_ $$uhttp://dx.doi.org/10.1088/0953-8984/16/30/013
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