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Ultrafast enhancement of ferromagnetism via photoexcited holes in GaMnAs | | J Wang
; I Cotoros
; K M Dani
; X Liu
; J K Furdyna
; D S Chemla
; | | Date: |
25 May 2007 | | Journal: | Phys Rev Lett, 98 (21), 217401 | | Abstract: | We report on the observation of ultrafast photoenhanced ferromagnetism in GaMnAs. It is manifested as a transient magnetization increase on a 100 ps time scale, after an initial subpicosecond demagnetization. The dynamic magnetization enhancement exhibits a maximum below the Curie temperature T(c) and dominates the demagnetization component when approaching T(c). We attribute the observed ultrafast collective ordering to the p-d exchange interaction between photoexcited holes and Mn spins, leading to a correlation-induced peak around 20 K and a transient increase in T(c). | | Source: | PubMed, pmid17677804 | | Other source: | [GID 994349] cond-mat/0702439 | | Services: | Forum | Review | Favorites | |
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