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Misfit Relaxation Mechanisms and Domain Ordering in Anisotropically Strained Manganite Thin Films
Zixun Zhang1, Qiyuan Feng2, Feng Jin1
1Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.
Anisotropic strain in Pr0.5Sr0.5MnO3 films evolves hierarchically with thickness. This structural evolution, including domain ordering, impacts magnetic and transport properties, offering new avenues for film engineering.
Area of Science:
- Materials Science
- Solid State Physics
- Thin Film Growth
Background:
- Epitaxial thin films exhibit complex structural behaviors influenced by substrate interactions.
- Anisotropic strain is a critical factor in determining the properties of functional oxide films.
Purpose of the Study:
- To characterize the anisotropic strain evolution in epitaxial Pr0.5Sr0.5MnO3 films.
- To correlate structural evolution with magnetic and magnetotransport properties.
- To visualize and understand domain ordering dynamics.
Main Methods:
- Off-specular X-ray reciprocal space mapping.
- Magnetic force microscopy.
Main Results:
- A multistage hierarchical structural evolution (domain ordering, twin domains, periodic modulations) was observed with increasing film thickness.
- Structural modulation differed between in-plane directions due to monoclinic distortion.
- Domain configurations were linked to thickness-dependent magnetic and magnetotransport properties.
- Magnetic force microscopy revealed domain ordering dynamics and specific crystallographic orientations.
Conclusions:
- The study elucidates the intricate relationship between anisotropic strain, structural evolution, and functional properties in Pr0.5Sr0.5MnO3 films.
- Direct visualization of domain dynamics provides insights for controlling domain engineering in perovskite oxides.
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