Picosecond acoustic-excitation-driven ultrafast magnetization dynamics in dielectric Bi-substituted yttrium iron garnet

Using femtosecond optical pulses, we have investigated the ultrafast magnetization dynamics induced in a dielectric film of bismuth-substituted yttrium iron garnet (Bi-YIG) buried below a thick Cu/Pt metallic bilayer. We show that exciting the sample from the Pt surface launches an acoustic strain p...

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Bibliographic Details
Published in:Physical review. B 2018-11, Vol.98 (17), p.174407, Article 174407
Main Authors: Deb, Marwan, Popova, Elena, Hehn, Michel, Keller, Niels, Mangin, Stéphane, Malinowski, Gregory
Format: Article
Language:English
Subjects:
Acoustic propagation
Anisotropy
Bismuth
Condensed Matter
Copper
Femtosecond pulses
Ferromagnetic resonance
Ferromagnetism
Garnets
Heterostructures
Iron
Magnetization
Magnetostriction
Materials Science
Optical pulses
Physics
Pulse propagation
Substitutes
Yttrium
Yttrium-iron garnet
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Summary:Using femtosecond optical pulses, we have investigated the ultrafast magnetization dynamics induced in a dielectric film of bismuth-substituted yttrium iron garnet (Bi-YIG) buried below a thick Cu/Pt metallic bilayer. We show that exciting the sample from the Pt surface launches an acoustic strain pulse propagating into the garnet film. We discovered that this strain pulse induces a coherent magnetization precession in the Bi-YIG at the frequency of the ferromagnetic resonance. The observed phenomena can be explained by strain-induced changes of magnetocrystalline anisotropy via the inverse magnetostriction effect. These findings open perspectives toward the control of the magnetization in magnetic garnets embedded in complex heterostructure devices.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.174407