Magnetism, spintronics

Quantum theory of inverse magneto-optical effects in rare earth compounds

A. I. Popov^a, A. K. Zvezdin^bc, D. I. Plokhov<sup>bd

a</sup> National Research University of Electronic Technology
^b Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow
^c P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
^d Peoples' Friendship University of Russia named after Patrice Lumumba, Moscow

Abstract: Inverse magneto-optical effects arising from the action of short laser pulses on rare-earth ions in various materials are investigated. Primary attention is paid to direct allowed electric dipole $f$–$d$ and $f$–$g$ transitions. A theoretical model describing the interaction of ions with the electric field of a laser pulse wave is developed. Expressions for calculating the states of rare-earth ions in the field of an electromagnetic wave are derived. The results show that direct $f$–$d$ transitions decisively shape the dynamics of magnetic excitations in the material, which is confirmed by numerical calculations for dysprosium orthoferrite.

Keywords: inverse magneto-optical effects, rare earth ions, $f$–$d$ and $f$–$g$ transitions, short laser pulses, dysprosium orthoferrite.

Received: 09.11.2025
Revised: 09.11.2025
Accepted: 16.11.2025

DOI: 10.61011/FTT.2025.11.62138.316-25

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