Laser-Induced Magnetization Precession in Individual Magnetoelastic Domains of a Multiferroic Co40Fe40B20/BaTiO3 Composite
| Autor: | L. A. Shelukhin, A. V. Scherbakov, Sampo J. Hämäläinen, S. van Dijken, Alexandra M. Kalashnikova, D. A. Kirilenko, D. L. Kazenwadel, N. A. Pertsev |
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| Rok vydání: | 2020 |
| Předmět: |
Magnetization dynamics
Materials science Magnetic domain Condensed matter physics Demagnetizing field General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology Coupling (probability) 01 natural sciences Orientation (vector space) Condensed Matter::Materials Science Magnetization 0103 physical sciences Multiferroics 010306 general physics 0210 nano-technology Anisotropy |
| Zdroj: | Physical Review Applied. 14 |
| ISSN: | 2331-7019 |
| DOI: | 10.1103/physrevapplied.14.034061 |
| Popis: | 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 ${\mathrm{Co}}_{40}{\mathrm{Fe}}_{40}{\mathrm{B}}_{20}$ layer by elastic coupling to ferroelectric domains in a ${\mathrm{Ba}\mathrm{Ti}\mathrm{O}}_{3}$ 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 ${\mathrm{Co}}_{40}{\mathrm{Fe}}_{40}{\mathrm{B}}_{20}$ 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 $n\ensuremath{\approx}2$. 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. |
| Databáze: | OpenAIRE |
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