All-optical probe of precessional magnetization dynamics in exchange biased NiFe/FeMn bilayers

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dc.creatorWeber, M. C.
dc.creatorNembach, H.
dc.creatorHillebrands, B.
dc.creatorFassbender, J.
dc.date2005-07-20
dc.date.accessioned2026-07-07T03:06:03Z
dc.date.available2026-07-07T03:06:03Z
dc.descriptionAn internal anisotropy pulse field is launched by an 8.3 ps short laser excitation, which triggers precessional magnetization dynamics of a polycrystalline NiFe/FeMn exchange bias system on the picosecond timescale. Due to the excitation the unidirectional anisotropy and, thus, the exchange coupling across the interface between the ferromagnetic and the antiferromagnetic layer is reduced, leading to a fast reduction of the exchange bias field and to a dramatic increase of the zero-field susceptibility. The fast optical unpinning is followed by a slower recovery of the interfacial exchange coupling dominated by spin-lattice and heat flow relaxation with a time constant of the order of 160 ps. The measured picosecond time evolution of the exchange decoupling and restoration is interpreted as an anisotropy pulse field giving rise to fast precessional magnetization dynamics of the ferromagnetic layer. The strength of the internal pulse field and even the initial magnetization deflection direction from the equilibrium orientation can be controlled by the absorbed photons. The dependence of the effective Gilbert damping on both small and large angle precessional motion was studied, yielding that both cases can be modeled with reasonable accuracy within the Landau-Lifshitz and Gilbert framework.
dc.description28 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0507475
dc.identifierhttp://arxiv.org/abs/cond-mat/0507475
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/26673
dc.subjectMaterials Science
dc.titleAll-optical probe of precessional magnetization dynamics in exchange biased NiFe/FeMn bilayers
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