What question did this study set out to answer?

To explore the scalable growth of iron oxide polymorphs and their structure and magnetic properties based on substrate selection.

March 16, 2026

Epitaxial Iron Oxides via Scalable Solution-Based Growth: Structure and Defect-Mediated Properties

Q: What does this research mean for the field?

Spray pyrolysis enables the scalable, substrate-selective epitaxial growth of iron-oxide polymorphs with structural and magnetic quality comparable to vacuum-based methods. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

Key Points

To explore the scalable growth of iron oxide polymorphs and their structure and magnetic properties based on substrate selection.
Utilized spray pyrolysis for nonvacuum growth of iron oxide films.
Conducted X-ray diffraction and rocking-curve measurements to verify epitaxial quality.
Measured magnetic properties of α-Fe2O3 and γ-Fe2O3 films under controlled conditions.
Examined temperature-dependent transport to understand defect-mediated effects.
Confirmed stabilization of α-Fe2O3 on c-Al2O3 and γ-Fe2O3 on MgO, indicating substrate influence.
Achieved high-quality epitaxy with rocking-curve FWHM of 0.126° for α-Fe2O3 and 0.160° for γ-Fe2O3.
Observed ferrimagnetic order in γ-Fe2O3 (∼440 emu·cm–3) and enhanced canted magnetism in α-Fe2O3 (∼120 emu·cm–3).
Noted significant magnetoresistance linked to defects in γ-Fe2O3.

Abstract

We demonstrate substrate-selective epitaxial growth of iron-oxide polymorphs by spray pyrolysis, establishing a scalable, nonvacuum route to crystalline magnetic oxides. Under identical deposition conditions (718 ± 5 K), corundum α-Fe2O3 is stabilized on c-Al2O3(0001), whereas spinel γ-Fe2O3 forms on MgO(100), highlighting the dominant role of interfacial lattice matching in phase selection via coherent interface stabilization of the lowest-energy polymorph. X-ray diffraction, ϕ-scans, RSM and ex situ RHEED confirm high-quality epitaxy, with instrument-corrected rocking-curve FWHM of 0.126° for α-Fe2O3 and 0.160° for γ-Fe2O3. Magnetic measurements reveal an in-plane easy axis for both films, with bulk-like ferrimagnetic order in γ-Fe2O3 (∼440 emu·cm–3) and an enhanced canted state in α-Fe2O3 (∼120 emu·cm–3). Temperature-dependent transport further links functional response to the defect landscape, with antiphase-boundary-mediated magnetoresistance in γ-Fe2O3 and a suppressed Morin transition in α-Fe2O3. These results demonstrate that spray pyrolysis enables phase-engineered epitaxial iron oxides with structural and magnetic quality comparable to vacuum-based methods.

Bookmark

Cite This Study

Ainabayev et al. (Fri,) studied this question.

synapsesocial.com/papers/69b79dce8166e15b153aaf92 https://doi.org/https://doi.org/10.1021/acs.cgd.5c01331

Bookmark