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Article Dans Une Revue Physical Review B Année : 2021

Ultrafast control of lattice strain via magnetic circular dichroism

Résumé

Using ultrafast x-ray diffraction, we directly monitor the lattice dynamics induced by femtosecond laser pulses in nanoscale thin films of bismuth iron garnet in external magnetic fields H ext. We control the ultrafast laserinduced lattice strain amplitude by changing the laser pulse helicity. The strength of H ext is used as an external parameter to switch the helicity dependence on and off, respectively. Based on magneto-optical spectroscopic measurements, we explain these phenomena by magnetic circular dichroism. Our findings highlight an important approach for ultrafast manipulation of lattice strain in magnetic materials, in particular insulators, and open exciting perspectives towards ultrafast control of lattice strain and heat-induced magnetization switching and spin waves in bismuth substituted iron garnets using the polarization of light.
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hal-03439604 , version 1 (22-11-2021)

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Marwan Deb, Elena Popova, Steffen Peer Zeuschner, Wolfram Leitenberger, Niels Keller, et al.. Ultrafast control of lattice strain via magnetic circular dichroism. Physical Review B, 2021, 103, ⟨10.1103/physrevb.103.064301⟩. ⟨hal-03439604⟩
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