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Tailoring magnetic interlayer coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices.
1Abteilung Supraleitung und Magnetismus, Universität Leipzig, D-04103 Leipzig, Germany.
Physical Review Letters
|May 21, 2010
Summary
We investigated magnetic coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices. Antiferromagnetic coupling, influenced by interfaces, is mediated by Mn-O-Ru bonds, correlating with magnetic moments.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- La0.7Sr0.3MnO3 and SrRuO3 are complex oxide materials exhibiting unique magnetic properties.
- Superlattices offer a platform to study interfacial phenomena and emergent magnetic behaviors.
Purpose of the Study:
- To investigate the magnetic interlayer coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices.
- To understand the role of interfacial properties and magnetocrystalline anisotropy in determining coupling behavior.
Main Methods:
- Fabrication of high-quality superlattices with ultrathin layers using pulsed laser deposition.
- Characterization of structural coherence and interfacial intermixing.
- Ab initio theoretical calculations to elucidate coupling mechanisms.
Main Results:
- Coherent growth of superlattices with minimal Mn/Ru intermixing (approx. one interfacial monolayer).
- Observation of strong antiferromagnetic interlayer coupling dependent on magnetocrystalline anisotropy and interface quality.
- Theoretical confirmation that antiferromagnetic coupling is mediated by the Mn-O-Ru bond.
Conclusions:
- The magnetic interlayer coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices is strongly antiferromagnetic.
- Interfacial Mn/Ru intermixing and magnetocrystalline anisotropy are critical factors controlling the coupling strength.
- Ab initio calculations provide a quantitative link between intermixing and the superlattice's total magnetic moment.
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