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000057121 084__ $$2WoS$$aPhysics, Condensed Matter
000057121 1001_ $$0P:(DE-Juel1)VDB54416$$aPerroni, C. A.$$b0$$uFZJ
000057121 245__ $$aMagnetization dynamics in dysprosium orthoferrites via the inverse Faraday effect
000057121 260__ $$aCollege Park, Md.$$bAPS$$c2006
000057121 300__ $$a134430
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000057121 520__ $$aThe ultrafast nonthermal control of magnetization has recently become feasible in canted antiferromagnets through photomagnetic instantaneous pulses [A. V. Kimel , Nature 435, 655 (2005)]. In this experiment, circularly polarized femtosecond laser pulses set up a strong magnetic field along the wave vector of the radiation through the inverse Faraday effect, thereby exciting nonthermally the spin dynamics of dysprosium orthoferrites. A theoretical study is performed by using a model for orthoferrites based on a general form of free energy whose parameters are extracted from experimental measurements. The magnetization dynamics is described by solving coupled sublattice Landau-Lifshitz-Gilbert equations whose damping term is associated with the scattering rate due to magnon-magnon interaction. Due to the inverse Faraday effect and the nonthermal excitation, the effect of the laser is simulated by magnetic-field Gaussian pulses with temporal width of the order of 100 fs. When the field is along the z axis, a single resonance mode of the magnetization is excited. The amplitude of the magnetization and out-of-phase behavior of the oscillations for fields in the z and -z directions are in good agreement with the cited experiment. The analysis of the effect of the temperature shows that the magnon-magnon scattering mechanism affects the decay of the oscillations on the picosecond scale. Finally, when the field pulse is along the x axis, another mode is excited, as observed in experiments. In this case, a comparison between theoretical and experimental results shows some discrepancies, the origin of which is related to the role played by anisotropies in orthoferrites.
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000057121 7001_ $$0P:(DE-Juel1)VDB941$$aLiebsch, A.$$b1$$uFZJ
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000057121 773__ $$0PERI:(DE-600)2844160-6$$a10.1103/PhysRevB.74.134430$$gVol. 74, p. 134430$$n13$$p134430$$q74<134430$$tPhysical review / B$$v74$$x1098-0121$$y2006
000057121 8567_ $$uhttp://dx.doi.org/10.1103/PhysRevB.74.134430
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