Ab Initio Study of the Intrinsic Exchange Bias at the SrRuO${}_3$/SrMnO${}_3$ Interface

Abstract

In a recent publication (S. Dong et al., Phys. Rev. Lett.103, 127201 (2009)), two (related) mechanisms were proposed to understand the intrinsic exchange bias present in oxides heterostructures involving G-type antiferromagnetic perovskites. The first mechanism is driven by the Dzyaloshinskii-Moriya interaction, which is a spin-orbit coupling effect. The second is induced by the ferroelectric polarization, and it is only active in heterostructures involving multiferroics. Using the SrRuO${}_3$/SrMnO${}_3$ superlattice as a model system, density-functional calculations are here performed to verify the two proposals. This proof-of-principle calculation provides convincing evidence that qualitatively supports both proposals.

7 pages, 3 figures; Accepted by PRB

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• Correlated Quantum Phenomena of Spin-Orbit Coupled Perovskite Oxide Heterostructures: Cases of SrRuO3 and SrIrO3-Based Artificial Superlattices
• Giant Exchange Bias in the Single-layered Ruddlesden-Popper Perovskite SrLaCo0.5Mn0.5O4
• Ferroelectric Control of Magnetism and Transport in Oxide Heterostructures
• New iron-based multiferroics with improper ferroelectricity
• Magnetism and electronic structure of ($001$)- and ($111$)-oriented LaTiO${}_3$ bilayers sandwiched in LaScO${}_3$ barriers
• Growth-sequence-dependent interface magnetism of SrIrO${}_3$ - La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$ bilayers
• Understanding the non-collinear antiferromagnetic IrMn${}_3$ surfaces and their exchange-biased heterostructures from first principles