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

作者：Kapetanakis M D; Lingos P C; Piermarocchi C; Wang J; Perakis I E^*

来源：Applied Physics Letters, 2011, 99(9): 091111.

DOI：10.1063/1.3634031

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 100 fs, during nonlinear coherent photoexcitation. For a single optical pulse, magnetization reversal is completed after similar to 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.

• 出版日期2011-8-29