Double-Exchange Interaction in Optically Induced Nonequilibrium State: A Conversion from Ferromagnetic to Antiferromagnetic Structure

Atsushi Ono, Sumio Ishihara

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The double-exchange (DE) interaction, that is, a ferromagnetic (FM) interaction due to a combination of electron motion and the Hund coupling, is a well-known source of a wide class of FM orders. Here, we show that the DE interaction in highly photoexcited states is antiferromagnetic (AFM). Transient dynamics of quantum electrons coupled with classical spins are analyzed. An ac field applied to a metallic FM state results in an almost perfect Néel state. A time characterizing the FM-to-AFM conversion is scaled by light amplitude and frequency. This hidden AFM interaction is attributable to the electron-spin coupling under nonequilibrium electron distribution.

Original languageEnglish
Article number207202
JournalPhysical review letters
Volume119
Issue number20
DOIs
Publication statusPublished - 2017 Nov 16

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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