Bidimensional perovskite systems for spintronic applications

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• The perovskite Sr2FeMoO6 (SFMO) exhibits half-metallic properties, making it a candidate for spintronic devices.
• Its electronic and magnetic properties can be tuned by altering spatial confinement and transition metal composition.
• Theoretical studies on confined SFMOs with varying transition metal content are lacking.

Purpose of the Study:

• To investigate the electronic properties of confined SFMO slabs with different Fe:Mo atomic ratios.
• To understand how spatial confinement and composition affect the half-metallic behavior of SFMO.
• To explore the influence of oxygen atoms on the magnetic properties of confined SFMO.

Main Methods:

• Spin-polarized first-principles density functional theory (DFT).
• Hubbard-corrected local density approximation (LDA+U).
• Supercell scheme for modeling insulated SFMO slabs with free surfaces parallel to the (001) plane.
• Investigated Fe:Mo ratios of 1:1, 1:0, and 0:1.

Main Results:

• Confinement leads to the loss of half-metallicity in SFMO, resulting in a conductive state.
• The material's conductivity is independent of the Fe:Mo atomic ratio under confinement.
• Oxygen atoms play a crucial role in determining the magnetic moment of the SFMO slabs.

Conclusions:

• The studied confined SFMO slabs transition from half-metallic to conductive behavior.
• The findings suggest potential applications for SFMO beyond spintronics.
• Understanding the impact of confinement and composition is key for material design.