Ferromagnetic exchange, spin-orbit coupling and spiral magnetism at the LaAlO 3-SrTiO 3 interfaceReport as inadecuate



 Ferromagnetic exchange, spin-orbit coupling and spiral magnetism at the LaAlO 3-SrTiO 3 interface


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The electronic properties of the polar interface between insulating oxides is a subject of great current interest. An exciting new development is the observation of robust magnetism at the interface of two non-magnetic materials LaAlO 3 (LAO) and SrTiO 3 (STO). Here we present a microscopic theory for the formation and interaction of local moments, which depends on essential features of the LAO-STO interface. We show that correlation-induced moments arise due to interfacial splitting of orbital degeneracy. We find that gate-tunable Rashba spin-orbit coupling at the interface influences the exchange interaction mediated by conduction electrons. We predict that the zero-field ground state is a long-wavelength spiral and show that its evolution in an external field accounts semi-quantitatively for torque magnetometry data. Our theory describes qualitative aspects of the scanning SQUID measurements and makes several testable predictions for future experiments.



Author: Sumilan Banerjee; Onur Erten; Mohit Randeria

Source: https://archive.org/







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