Quantum theory of femtosecond optomagnetic effects for rare-earth ions in DyFeO3

Our theoretical analysis shows that a femtosecond laser pulse can efficiently launch magnetization dynamics of Dy 3+ ions in DyFeO3 and DyAlO3 . Excitation of electrons from the ground state to the low-lying electronic level of Dy 3+ ions by circularly or linearly polarized light can be seen as a re...

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Bibliographic Details
Published in:Physical review. B 2021-01, Vol.103 (1), p.014423
Main Authors: Popov, A I, Zvezdin, K A, Gareeva, Z V, Kimel, A V, Zvezdin, A K
Format: Article
Language:English
Subjects:
Anisotropy
Femtosecond pulses
Laser pumping
Linear polarization
Magnetic moments
Magnetism
Magnetization
Metal ions
Polarized light
Quantum theory
Rare earth elements
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Summary:Our theoretical analysis shows that a femtosecond laser pulse can efficiently launch magnetization dynamics of Dy 3+ ions in DyFeO3 and DyAlO3 . Excitation of electrons from the ground state to the low-lying electronic level of Dy 3+ ions by circularly or linearly polarized light can be seen as a result of an effective magnetic field acting on the magnetic moments of the rare-earth ions. It is shown that the launched magnetization dynamics can be expressed as a combination of coherent oscillations of mutually parallel and mutually antiparallel magnetic moments of Dy 3+ ions, respectively. While the antiparallel magnetic moments lie in the plane perpendicular to the wave vector of light in the medium k , the parallel magnetic moments are aligned along k . The magnetization dynamics depend strongly on the duration and the shape of the pumping laser pulse, as well as on the anisotropy in properties of the rare-earth ion.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.103.014423