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

TitleAll-optical four-state magnetization reversal in (Ga,Mn)As ferromagnetic semiconductors
Publication TypeJournal Article
Year of Publication2011
AuthorsKapetanakis MD, Lingos PC, Piermarocchi C, Wang J, Perakis IE
Journal TitleApplied Physics Letters
Date Published08
Type of ArticleArticle
ISBN Number0003-6951
Accession NumberWOS:000294489300010
Keywordsanisotropy, dynamics, spin, ultrafast

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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3634031]

Alternate JournalAppl. Phys. Lett.