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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-09
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Language
en
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12
1-12
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Physical Review Applied, Volume 14, issue 3
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.
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Shelukhin , L A , Pertsev , N A , Scherbakov , A V , Kazenwadel , D L , Kirilenko , D A , Hämälaïnen , S J , Van Dijken , S & Kalashnikova , A M 2020 , ' Laser-induced magnetization precession in individual magnetoelastic domains of a multiferroic Co40Fe40 B20/BaTi O3 composite ' , Physical Review Applied , vol. 14 , no. 3 , 034061 , pp. 1-12 . https://doi.org/10.1103/PhysRevApplied.14.034061