Effect of optical f-f excitations on the Nd-Fe exchange interaction in Nd ferroborate with multiferroic properties

Vladimir A. Gavrichkov, Alexandr V. Malakhovskii, Sergey G. Ovchinnikov

Research output: Contribution to journalArticlepeer-review

Abstract

We considered the effect of optical pumping at the f-f transitions frequency on d-f superexchange in the rare-earth antiferromagnetic ferroborate Nd0.5Gd0.5Fe3(BO3)4 between Nd3+ ions in the excited states of the 4G5/2, 2G7/2, and Fe3+ in the ground state 6A1. In the ferroborate, d-f superexchange is directly related to the strong magnetoelectric coupling observed in the ground state of the material. We show that under optical pumping at the frequency of f-f transitions 4I9/2↔(4G5/2+2G7/2) in the Nd3+ ion, the nature of the d-f interaction changes to FM. The phenomena can be explained by the occupation of the excited Nd3+ "spin pure"states with spin 1/2, or their mixing to the optically excited states with spin 3/2 due to the spin-orbit interaction. Near optically excited ions Nd3+, magnetic frustrations change from FM ordering under the d-f AFM interaction to AFM ordering under the FM interaction in the basal hexagonal plane.

Original languageEnglish
Article number064445
JournalPhysical Review B
Volume104
Issue number6
DOIs
StatePublished - 1 Aug 2021
Externally publishedYes

Bibliographical note

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© 2021 American Physical Society.

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