Carrier-mediated magnetoelectricity in complex oxide heterostructures

Abstract

While tremendous success has been achieved to date in creating both single phase and composite magnetoelectric materials, the quintessential electric-field control of magnetism remains elusive. In this work, we demonstrate a linear magnetoelectric effect which arises from a novel carrier-mediated mechanism, and is a universal feature of the interface between a dielectric and a spin-polarized metal. Using first-principles density functional calculations, we illustrate this effect at the SrRuO${}_3$/SrTiO${}_3$ interface and describe its origin. To formally quantify the magnetic response of such an interface to an applied electric field, we introduce and define the concept of spin capacitance. In addition to its magnetoelectric and spin capacitive behavior, the interface displays a spatial coexistence of magnetism and dielectric polarization suggesting a route to a new type of interfacial multiferroic.

References in corpus (2)

• Towards ferroelectrically-controlled magnetism: Magnetoelectric effect in Fe/BaTiO3 multilayers
• Magnetic and electric phase control in epitaxial EuTiO${}_3$ from first principles

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