A single-phase room-temperature multiferroic with strong magnetoelectric coupling · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title
A single-phase room-temperature multiferroic with strong magnetoelectric coupling
Plain · changed
Revision 1: BiFeO3 is magnetic and ferroelectric at room temperature but has almost no net magnetization, while materials with strong coupling between the two orders work only at low temperature. No single material yet combines both at room temperature.
Revision 2: $\mathrm{BiFeO_3}$ is magnetic and ferroelectric at room temperature but has almost no net magnetization, while materials with strong coupling between the two orders work only at low temperature. No single material yet combines both at room temperature.
Precise · changed · core
Revision 1: Identify a single-phase compound with ferroelectric polarization above about $3e3\ \mathrm{statC}/\mathrm{cm}^{2}$ and net magnetization above $10\ \mathrm{emu}/\mathrm{cm}^{3}$ at $T = 300\ \mathrm{K}$, in which an electric field deterministically reverses (or rotates by $90\ \text{degrees}$) the magnetization. An answer is a material with measured P, $M$ and demonstrated electric-field reversal of M at $300\ \mathrm{K}$ without a ferromagnetic overlayer.
Revision 2: Identify a single-phase compound with ferroelectric polarization above about $3 \times 10^{3}\ \mathrm{statC}/\mathrm{cm}^{2}$ and net magnetization above $10\ \mathrm{emu}/\mathrm{cm}^{3}$ at $T = 300\ \mathrm{K}$, in which an electric field deterministically reverses (or rotates by $90\ \text{degrees}$) the magnetization. An answer is a material with measured $P$, $M$ and demonstrated electric-field reversal of $M$ at $300\ \mathrm{K}$ without a ferromagnetic overlayer.
Settled by
Synthesis and measurement of a single-phase compound showing 300 K polarization and magnetization hysteresis plus electric-field-driven magnetization reversal imaged by XMCD-PEEM or magnetic force microscopy.
Kind
well-posed
Answer type
identification
References
(empty)
Literature status
open
Status note · changed
Revision 1: Deterministic switching at $300\,\mathrm{K}$ so far uses BiFeO3 coupled to a ferromagnetic layer (Heron et al., Nature 2014).
Revision 2: Deterministic switching at $300\,\mathrm{K}$ so far uses $\mathrm{BiFeO_3}$ coupled to a ferromagnetic layer (Heron et al., Nature 2014).
Posed since
(empty)

Decisions