Author： Zhang G. P. Si M. S. George T. F.
Publisher： Edp Sciences
E-ISSN： 1286-4854|94|1|17005-17005
ISSN： 0295-5075
Source： EPL (EUROPHYSICS LETTERS), Vol.94, Iss.1, 2011-04, pp. : 17005-17005
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Abstract
Most laser-induced femtosecond magnetism investigations are done in magnetic thin films. Nanostructured magnetic dots, with their reduced dimensionality, present new opportunities for spin manipulation. Here we predict that if a magnetic dot has a dipole-forbidden transition between the lowest occupied molecular orbital (LUMO) and the highest unoccupied molecular orbital (HOMO), but a dipole-allowed transition between LUMO+1 and HOMO, electromagnetically induced transparency can be used to prevent ultrafast laser-induced spin momentum reduction, or spin protection. This is realized through a strong dump pulse to funnel the population into LUMO+1. If the time delay between the pump and dump pulses is longer than 60 fs, a population inversion starts and spin switching is achieved. These predictions are detectable experimentally.
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