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

Loading...
Thumbnail Image
Access rights
openAccess
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-09
Major/Subject
Mcode
Degree programme
Language
en
Pages
12
1-12
Series
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.
Description
Keywords
Other note
Citation
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