Magnetization dynamics in thin magnetic films with spatio-temporal resolution

Piovera, Ch. (2011) Magnetization dynamics in thin magnetic films with spatio-temporal resolution. Il nuovo cimento C, 34 (5). pp. 85-94. ISSN 1826-9885

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Based on the Magneto-Optical Kerr Effect (MOKE), we have fully characterized the magnetization dynamics in thin magnetic films by measuring the three real-space components of the magnetization vector. Using the pump-probe technique it is possible to extract the time dependence of each individual projection with sub-picosecond resolution. This method has been exploited to investigate the temporal evolution of the magnetization (modulus and orientation) induced by an ultrashort laser pulse in thin epitaxial iron films. According to our results, we deduced that the initial sub-picosecond demagnetization is established at the electronic level through electron-magnon excitations. The subsequent dynamics is characterized by a precessional motion on the sub-nanosecond time scale, around an effective, time-dependent field. The temporal evolution of the magneto-crystalline anisotropy constant can be unambiguously determined, providing the experimental evidence that the precession is triggered by the rapid, optically induced misalignment between the magnetization vector and the effective field. These results suggest a possible pathway toward the ultrarapid switching of the magnetization.

Item Type: Article
Uncontrolled Keywords: Magnetic properties of thin films, surfaces, and interfaces ; Magneto-optical effects ; Spin waves ; Spectroscopy of solid state dynamics
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 08 Apr 2020 16:36
Last Modified: 08 Apr 2020 16:36

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