Laser-induced magnetization precession in individual magnetoelastic domains of a multiferroic Co40Fe40 B20/BaTi O3 composite

L. A. Shelukhin*, N. A. Pertsev, A. V. Scherbakov, D. L. Kazenwadel, D. A. Kirilenko, S. J. Hämälaïnen, S. Van Dijken, A. M. Kalashnikova

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Using a magneto-optical pump-probe technique with micrometer spatial resolution, we show that magnetization precession can be launched in individual magnetic domains imprinted in a Co40Fe40B20 layer by elastic coupling to ferroelectric domains in a BaTiO3 substrate. The dependence of the precession parameters on the strength and orientation of the external magnetic field reveals that laser-induced ultrafast partial quenching of the magnetoelastic coupling parameter of Co40Fe40B20 by approximately 27% along with 10% ultrafast demagnetization triggers the magnetization precession. The relation between the laser-induced reduction of the magnetoelastic coupling and the demagnetization is approximated by an n(n+1)/2 law with n≈2. This correspondence confirms the thermal origin of the laser-induced anisotropy change. Based on analysis and modeling of the excited precession, we find signatures of laser-induced precessional switching, which occurs when the magnetic field is applied along the hard magnetization axis and its value is close to the effective magnetoelastic anisotropy field. The precession-excitation process in an individual magnetoelastic domain is found to be unaffected by neighboring domains. This makes laser-induced changes of magnetoelastic anisotropy a promising tool for driving magnetization dynamics and switching in composite multiferroics with spatial selectivity.

Original languageEnglish
Article number034061
Pages (from-to)1-12
Number of pages12
JournalPhysical Review Applied
Volume14
Issue number3
DOIs
Publication statusPublished - Sep 2020
MoE publication typeA1 Journal article-refereed

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