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THz-driven ultrafast spin-lattice scattering in amorphous metallic ferromagnets

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arxiv 1604.04077 v1 pith:PCBZMBFE submitted 2016-04-14 cond-mat.mtrl-sci cond-mat.other

S. Bonetti , M.C. Hoffmann , M.-J. Sher , Z. Chen , S.-H. Yang , M. Samant , S.S.P. Parkin , H.A. Dürr This is my paper
classification cond-mat.mtrl-scicond-mat.other
keywords amorphousscatteringspin-latticeultrafastcofebdemagnetizationdynamicsferromagnets
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abstract

We use single-cycle THz fields and the femtosecond magneto-optical Kerr effect to respectively excite and probe the magnetization dynamics in two thin-film ferromagnets with different lattice structure: crystalline Fe and amorphous CoFeB. We observe Landau-Lifshitz-torque magnetization dynamics of comparable magnitude in both systems, but only the amorphous sample shows ultrafast demagnetization caused by the spin-lattice depolarization of the THz-induced ultrafast spin current. Quantitative modelling shows that such spin-lattice scattering events occur on similar time scales than the conventional spin conserving electronic scattering ($\sim30$ fs). This is significantly faster that optical laser-induced demagnetization. THz conductivity measurements point towards the influence of lattice disorder in amorphous CoFeB as the driving force for enhanced spin-lattice scattering.

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