The effect of Coulomb interaction at ferromagnetic-paramagnetic metallic perovskite junctions

TL;DR

This paper investigates how Coulomb interactions influence charge transfer and magnetic coupling in ferromagnetic-paramagnetic-metallic oxide junctions, revealing oscillatory behavior and sensitivity to material parameters.

Contribution

It introduces a charge transfer model considering atomic planes and analyzes Coulomb effects on magnetic coupling in oxide junctions, highlighting the impact of charge transfer and dielectric properties.

Findings

Magnetic coupling oscillates with spacer thickness similar to RKKY but with Coulomb-sensitive amplitude.

Large differences in charge transfer effects occur at small spacer thickness depending on material parameters.

Coulomb interactions significantly affect charge transfer and magnetic coupling in oxide junctions.

Abstract

We study the effect of Coulomb interactions in transition metal oxides junctions. In this paper we analyze charge transfer at the interface of a three layer ferromagnetic-paramagnetic-ferromagnetic metallic oxide system. We choose a charge model considering a few atomic planes within each layer and obtain results for the magnetic coupling between the ferromagnetic layers. For large number of planes in the paramagnetic spacer we find that the coupling oscillates with the same period as in RKKY but the amplitude is sensitive to the Coulomb energy. At small spacer thickness however, large differences may appear as function of : the number of electrons per atom in the ferromagnetics and paramagnetics materials, the dielectric constant at each component, and the charge defects at the interface plane emphasizing the effects of charge transfer.