All-optical four-state magnetization reversal in (Ga,Mn)As ferromagnetic semiconductors

Details All-optical four-state magnetization reversal in (Ga,Mn)As ferromagnetic semiconductors All-optical four-state magnetization reversal in (Ga,Mn)As ferromagnetic semiconductors

2011-08-16

arxiv.org/abs/1108.3193v1

Physics

Optics

3 pages, 2 figures, submitted in Applied Physics Letters

Scientific paper

Using density matrix equations of motion and a tight-binding band calculation, we predict all-optical switching between four metastable magnetic states of (III,Mn)As ferromagnets. This switching is initiated non-thermally within 100fs, during nonlinear coherent photoexcitation. For a single optical pulse, magnetization reversal is completed after $\sim$100 ps and controlled by the coherent femtosecond photoexcitation. Our predicted switching comes from magnetic nonlinearities triggered by a femtosecond magnetization tilt that is sensitive to un--adiabatic light--induced spin interactions.

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