Magnetic charges and magnetoelectricity in hexagonal rare-earth manganites and ferrites

Abstract

Magnetoelectric (ME) materials are of fundamental interest and show broad potential for technological applications. Commonly the dominant contribution to the ME response is the lattice-mediated one, which is proportional to both the Born electric charge $Z^{\mathrm{e}}$ and its analogue, the dynamical magnetic charge $Z^{\mathrm{m}}$. Our previous study has shown that exchange striction acting on noncollinear spins induces much larger magnetic charges than those that depend on spin-orbit coupling. The hexagonal manganites $R$MnO${}_3$ and ferrites $R$FeO${}_3$ ($R$ = Sc, Y, In, Ho-Lu) exhibit strong couplings between electric, magnetic and structural degrees of freedom, with the transition-metal ions in the basal plane antiferromagnetically coupled through super-exchange so as to form a 120${}^{\circ }$ noncollinear spin arrangement. Here we present a theoretical study of the magnetic charges, and of the spin-lattice and spin-electronic ME constants, in these hexagonal manganites and ferrites, clarifying the conditions under which exchange striction leads to an enhanced $Z^{\mathrm{m}}$ values and anomalously large in-plane spin-lattice ME effects.

References in corpus (5)

• Topological defects as relics of emergent continuous symmetry and Higgs condensation of disorder in ferroelectrics
• Magnetic Structure and Ordering of Multiferroic Hexagonal LuFeO3
• Full magnetoelectric response of Cr2O3 from first principles
• The Magnetoelectric Effect in Transition Metal Oxides: Insights and the Rational Design of New Materials from First Principles
• Dynamical magnetic charges and linear magnetoelectricity

Cited by in corpus (7)

• Tuning the Magnetic Ordering Temperature of Hexagonal Ferrites by Structural Distortion Control
• Magnetic excitations in bulk multiferroic two-dimensional triangular lattice antiferromagnet (Lu,Sc)FeO${}_3$
• Magnetization, specific heat, and thermal conductivity of hexagonal ErMnO${}_3$ single crystals
• Effects of biaxial strain on the improper multiferroicity in h-LuFeO3 films
• Magnetic monopoles and toroidal moments in LuFeO${}_3$ and related compounds
• A Self-Adaptive First-Principles Approach for Magnetic Excited States
• Recent Progress on Multiferroic Hexagonal Rare-Earth Ferrites (h-RFeO3, R = Y,Dy-Lu)