Magnetoelectric effect in the mixed valence polyoxovanadate cage V$_{12}$

TL;DR

This study investigates the magnetoelectric effect in mixed-valence polyoxovanadate molecules, showing electric field-induced spin control that is anisotropic, valence-dependent, and observable at room temperature, with implications for spintronics.

Contribution

It demonstrates that electric fields can induce a magnetoelectric effect in polyoxovanadate molecules through electron relocation, advancing molecular spin control methods.

Findings

Magnetoelectric effect is mainly caused by relocation of itinerant electrons.

The effect is highly anisotropic and depends on the valence state.

The effect can be observed at room temperature.

Abstract

Development of spintronic and quantum computing devices increases demand for efficient, energy saving method of spin manipulation at molecular scale. Polyoxovanadate molecular magnets being susceptible to both electric and magnetic fields may serve here as a good base material. In this paper two isostructural anions [V$_{12}$As$_8$O$_{40}$(HCO$_2$)]$^{n-}$ (with $n=3,5$) featuring two different mixed-valence states with itinerant and localized valence electrons are studied. The impact of the electric field on their magnetic properties is investigated by means of two complementary methods informed by magnetic measurements: effective Hamiltonian calculations and density functional theory. It is demonstrated that the magnetoelectric effect in theses molecules is induced mostly by relocation of itinerant electrons, is highly anisotropic, depends on the valence state and can be detected even at room temperature. These findings can pave the way to practical applications in which an electric field control over spin state is required.