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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 language | English |
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Article number | 034061 |
Pages (from-to) | 1-12 |
Number of pages | 12 |
Journal | Physical Review Applied |
Volume | 14 |
Issue number | 3 |
DOIs | |
Publication status | Published - Sept 2020 |
MoE publication type | A1 Journal article-refereed |
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Dive into the research topics of 'Laser-induced magnetization precession in individual magnetoelastic domains of a multiferroic Co40Fe40 B20/BaTi O3 composite'. Together they form a unique fingerprint.Projects
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Ionic control of electronic, magnetic, and plasmonic nanomaterials
van Dijken, S. (Principal investigator), Freire Fernandez, F. (Project Member), Perumbilavil, S. (Project Member), Lepikko, S. (Project Member), Farhan, A. (Project Member), Hagnäs, R. (Project Member) & Ameziane, M. (Project Member)
01/09/2018 → 31/08/2022
Project: Academy of Finland: Other research funding