Abstract
The ability of a femtosecond laser pulse to manipulate and reverse the magnetization in a ferrimagnetic Gd24Fe66.5Co9.5 thin film was studied experimentally as a function of temperature. For a fixed energy of the laser pulse, the dynamics of magnetization showed different behavior depending on whether the sample temperature was below or above the magnetization compensation point (T M ). The conditions for full ultrafast demagnetization and magnetization reversal were easily achieved below T M , while the same laser excitation caused just 50% demagnetization above T M . This interesting change in magnetization dynamics is qualitatively explained in terms of effective changes in the magnitudes of magnetizations of atomic sublattices.
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Contribution to the Topical Issue “New Trends in Magnetism and Magnetic Materials“, edited by Francesca Casoli, Massimo Solzi and Paola Tiberto.
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Medapalli, R., Razdolski, I., Savoini, M. et al. The role of magnetization compensation point for efficient ultrafast control of magnetization in Gd24Fe66.5Co9.5 alloy. Eur. Phys. J. B 86, 183 (2013). https://doi.org/10.1140/epjb/e2013-30682-6
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DOI: https://doi.org/10.1140/epjb/e2013-30682-6