Effect of interfacial Cr on magnetoelectricity of Fe2/CrO2/BaTiO3(001)
Martin H\"olzer, Michael Fechner, Sergey Ostanin, Ingrid Mertig
TL;DR
This study uses first-principles calculations to show that interfacial Cr can significantly enhance magnetoelectric effects in Fe/BaTiO3, enabling electric control of magnetic order at the atomic scale.
Contribution
It demonstrates that CrO2-terminated interfaces can dramatically improve magnetoelectric coupling in Fe/BaTiO3 multiferroics, revealing new ways to control magnetism electrically.
Findings
Cr interfacial layer enhances magnetoelectric coupling
Magnetic order switches with polarization reversal in Fe bilayer
Potential for electric control of magnetic states
Abstract
On the basis of first-principles calculations we study the effect of interfacial Cr on the magnetoelectric properties of a composite multiferroic Fe_L/BaTiO_3(001), with the Fe thickness L=1,2 monolayers. The use of the CrO_2-terminated interface instead of TiO_2 may significantly enhance magnetoelectricity in the system, showing an unexpected change in magnetization induced by the electric polarization reversal. In the case of L=2, for instance, the magnetic order of the Fe bilayer can be switched from nearly zero ferrimagnetic to ferromagnetic upon polarization reversal.
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