3 years ago

Formation of Ruddlesden–Popper Faults and Their Effect on the Magnetic Properties in Pr0.5Sr0.5CoO3 Thin Films

Formation
of Ruddlesden–Popper Faults and Their Effect on the Magnetic
Properties in Pr0.5Sr0.5CoO3 Thin
Films
Shao-Bo Mi, Shao-Dong Cheng, Lu Lu, Hong-Mei Jing, Sheng Cheng, Ming Liu, Chun-Lin Jia
Epitaxial Pr0.5Sr0.5CoO3 thin films have been grown on single-crystalline (La0.289Sr0.712)(Al0.633Ta0.356)O3(001) substrates by the pulsed laser deposition technique. The magnetic properties and microstructure of these films are investigated. It is found that Ruddlesden–Popper faults (RP faults) can be introduced in the films by changing the laser repetition rate. The segregation of Pr at the RP faults is characterized by atomic-resolution chemical mapping. The formation of the RP faults not only contributes to the epitaxial strain relaxation but also significantly decreases the ferromagnetic long-range order of the films, resulting in lower magnetizations than those of the fault-free films. Our results provide a strategy for tuning the magnetic properties of cobalt-based perovskite films by modifying the microstructure through the film growth process.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b16341

DOI: 10.1021/acsami.7b16341

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