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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Magnetism in iridate heterostructures leveraged by structural distortions
D Meyers1, Yue Cao2, G Fabbris2
1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York, 11973, USA. dmeyers@bnl.gov.
Scientific Reports
|March 14, 2019
Summary
Controlling magnetic coupling in heterostructures is key for designing magnetic materials. Researchers tuned magnetic interactions in strontium iridate superlattices by altering layer structure, revealing how subtle changes impact magnetic properties.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Controlling magnetic coupling in heterostructures is crucial for engineering magnetic ground states.
- Strontium iridate (SrIrO3) based superlattices offer a platform to study fundamental magnetic interactions.
Purpose of the Study:
- To tune magnetic interactions in SrIrO3/SrTiO3 superlattices by varying the number of SrIrO3 layers (single vs. bilayer).
- To understand the influence of heterostructure morphology on magnetic properties and phase stability.
Main Methods:
- Fabrication of superlattices with single and bilayers of SrIrO3 interfaced with SrTiO3.
- Magnetic scattering experiments to determine magnetic moment orientation.
- Resonant inelastic X-ray scattering (RIXS) to measure magnetic excitation gaps.
- X-ray diffraction (XRD) to probe structural modifications.
Main Results:
- Bilayer SrIrO3 superlattices exhibit predominantly c-axis antiferromagnetic ordering, similar to Sr3Ir2O7.
- Significant differences in magnetic excitation gaps were observed between single and bilayer structures, indicating altered magnetic phase stability.
- Single-layer SrIrO3 structures showed a more bulk-like magnetic excitation gap.
- Structural analysis revealed c-axis Ir-O-Ir bond bending as the primary driver for changes in magnetic interactions.
Conclusions:
- Subtle structural modulations in SrIrO3/SrTiO3 heterostructures can lead to substantial changes in magnetic interactions.
- Engineering heterostructure morphology provides a route to tailor and probe magnetic properties in spin-orbit coupled systems.
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