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THz-Driven Ultrafast Spin-Lattice Scattering in Amorphous Metallic Ferromagnets
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 8
2016 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, no 8, 087205Article in journal (Refereed) Published
Abstract [en]

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 structures: 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 modeling shows that such spin-lattice scattering events occur on similar time scales than the conventional spin conserving electronic scattering (similar to 30 fs). This is significantly faster than 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.

Place, publisher, year, edition, pages
2016. Vol. 117, no 8, 087205
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-134422DOI: 10.1103/PhysRevLett.117.087205ISI: 000381496400007PubMedID: 27588880OAI: diva2:1037228
Available from: 2016-10-14 Created: 2016-10-06 Last updated: 2016-10-14Bibliographically approved

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