Nouvelle équipe, nouvelle thématique de la Région Pays de La Loire
ULTRAFAST ACOUSTICS IN HYBRID MAGNETIC NANOSTRUCTURES
MS. Viktor Shalagatskyi (PhD-student)
Mr. Oleksandr Kovalenko (laboratory assistant)
Dr. Gwenaelle Vaudel (CNRS engineer)
Dr. Thomas Pezeril (CNRS researcher)
Dr. Vasily Temnov (CNRS researcher, project coordinator)
As a part of the large DPMC research group we are working in the emerging research field of ultrafast nano-optics with the main focus on the interaction of intense femtosecond laser pulses with hybrid magnetic nanostructures. Among many strategic goals of this long-term research project we are currently exploring physical mechanisms of ultrafast magnetization switching at the nano-scale.
Work in progress
Physical mechanisms of ultrafast all-optical magnetization switching magneto-elastic switching pioneered by Theo Rasing and co-workers [Stanciu et al., PRL 99, 047601 (2007)] are heavily debated in the literature, with most systematic investigations coming from the group of Martin Aeschlimann [Steil et al., PRB 84, 224498 (2011) and Alebrand et al., PRB 85, 092401 (2012)].
Possible relation between acoustics and all-optical magnetization switching has been noticed only recently [Temnov, Nature Photonics 6, 728 (2012)], but the emerging field of ultrafast magneto-elastic interactions pioneered in the groups of Manfred Bayer [Scherbakov et al., PRL 105, 117204 (2010)] and Jean-Yves Bigot [Kim et al., PRL 109, 166601 (2012)] is still very young and thus far away from the detailed microscopic understanding of magneto-elastic interactions.
Driven by recent progress in quantitative characterization of giant ultrashort acoustic pulses with strqin qmplitude exceeding 1% of lattice constant [Temnov et al., Nature Communications 4,1468 (2013)] we performed a detailed theoretical investigation on how these pulses interact with giant magneto-strictive material Terfenol-D [Kovalenko et al., Phys. Rev. Lett. 110, 266602 (2013)]. As we have shown in this manuscript, the perspectives of purely acoustical magnetization reversal in rare-earth compounds are quite encouraging and also provide a different view on the phenomenon of all-optical magnetization switching.
Further publications acknowledging the financial support by la Région Pays de La Loire
Update is coming soon!