Optimal interface doping at La_2/3Sr_1/3MnO_3/SrTiO_3(001) heterojunctions for spintronic applications

Abstract

We examine, by means of ab initio pseudopotential calculations, La_2/3Sr_1/3MnO_3/SrTiO_3 (LSMO/STO) heterojunctions in which one unit layer of La_(1-x)Sr_xMnO_3 (with 0<x<1) is inserted at the interface. The optimal interlayer doping x for a robust interface ferromagnetism is investigated by considering the energy differences between antiferromagnetic and ferromagnetic alignment of the MnO_2-interface layer relative to bulk LSMO. The optimal doping is found to be close to x=1/3, which corresponds to an abrupt TiO_2 (001)-layer termination of STO. This is also the composition which gives the largest p-type Schottky barrier height in our calculations.

5 pages, 4 figures

References in corpus (7)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Oxide spintronics
• Termination Control of the Interface Dipole in La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$/Nb:SrTiO${}_3$ (001) Schottky Junctions
• Determining the Curie temperature of La0.67Sr0.33MnO3 thin films
• Preventing the reconstruction of the polar discontinuity at oxide heterointerfaces
• Evolution of the band alignment at polar oxide interfaces
• Magnetic order and valency at La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$/SrTiO${}_3$ interfaces

Cited by in corpus (1)

• Full Control of Magnetism in Manganite Bilayer by Ferroelectric Polarization