Photo-induced spin dynamics in ferromagnetic semiconductor $p$-(Ga,Mn)As

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dc.creatorMitsumori, Y.
dc.creatorOiwa, A.
dc.creatorSlupinski, T.
dc.creatorMaruki, H.
dc.creatorKashimura, Y.
dc.creatorMinami, F.
dc.creatorMunekata, H.
dc.date2003-07-11
dc.date.accessioned2026-07-07T02:52:17Z
dc.date.available2026-07-07T02:52:17Z
dc.descriptionSpin dynamics in ferromagnetic $p$-(Ga,Mn)As ($x$ = 0.011, $T_{C}$ = 30 K) has been studied by carefully comparing the decay time of the photo-induced reflectivity change with the transient behavior of polar Kerr rotation induced by photo-generated carrier spins with a femtosecond light pulse of various polarizations. As to the rising process, the rate of Kerr rotation is found comparable to the generation rate of spin-polarized carriers. For the decay process, the Kerr rotation and reflectivity signal both show the same decay rate at above the $T_{C}$, whereas, below the $T_{C}$, the former becomes slower than the latter. The magnitude of Kerr rotation suggests that 10$^{2}$ Mn spins are revolved by injecting one hole spin. On the basis of these observations, collective rotation of ferromagnetically coupled Mn spins is discussed in terms of $p$-$d$ exchange interaction and successive transverse spin relaxation. Development of another long-lived behavior under external perpendicular magnetic fields is also disclosed.
dc.description4pages, 3figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0307268
dc.identifierhttp://arxiv.org/abs/cond-mat/0307268
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/21787
dc.subjectMaterials Science
dc.titlePhoto-induced spin dynamics in ferromagnetic semiconductor $p$-(Ga,Mn)As
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