Dynamical multiferroicity

Dominik M. Juraschek, Michael Fechner, Alexander V. Balatsky, Nicola A. Spaldin

Research output: Contribution to journalArticlepeer-review

126 Scopus citations

Abstract

An appealing mechanism for inducing multiferroicity in materials is the generation of electric polarization by a spatially varying magnetization that is coupled to the lattice through the spin-orbit interaction. Here we describe the reciprocal effect, in which a time-dependent electric polarization induces magnetization even in materials with no existing spin structure. We develop a formalism for this dynamical multiferroic effect in the case for which the polarization derives from optical phonons, and compute the strength of the phonon Zeeman effect, which is the solid-state equivalent of the well-established vibrational Zeeman effect in molecules, using density functional theory. We further show that a recently observed behavior - the resonant excitation of a magnon by optically driven phonons - is described by the formalism. Finally, we discuss examples of scenarios that are not driven by lattice dynamics and interpret the excitation of Dzyaloshinskii-Moriya-type electromagnons and the inverse Faraday effect from the viewpoint of dynamical multiferroicity.

Original languageEnglish
Article number014401
JournalPhysical Review Materials
Volume1
Issue number1
DOIs
StatePublished - 19 Jun 2017
Externally publishedYes

Funding

FundersFunder number
Walter Haefner Foundation
U.S. Department of EnergyE3B7
Seventh Framework Programme291151
European Research CouncilDM-321031
Eidgenössische Technische Hochschule Zürich
ETH Zürich Foundation

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