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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2504.02020 |
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| _version_ | 1866912306614501376 |
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| author | Balakrishnan, Ramachandran Dixit, Ambesh Rao, Mamidanna Sri Ramachandra |
| author_facet | Balakrishnan, Ramachandran Dixit, Ambesh Rao, Mamidanna Sri Ramachandra |
| contents | We grew a 2 micron thick film of single-phase BiFeO3 on a Si (100) substrate by pulsed laser deposition with a substrate temperature of 575 oC and an oxygen partial pressure of 0.06 mbar. X ray diffraction analysis indicated that the film exhibits textured growth along the (110) plane and possesses a rhombohedral R3c structure. Investigations using scanning electron microscopy and atomic force microscopy revealed an average grain size of about 300 nm and a surface roughness of 18 nm for the film. Energy dispersive X ray analysis estimated the composition of the film to be BiFeO2.85. Temperature- and magnetic field dependent magnetization measurements demonstrated weak ferromagnetic properties in the BiFeO2.85 film, with a non-zero spontaneous magnetization at H = 0 Oe across the temperature range of 2 to 300 K. Furthermore, the exchange bias field (HEB) of the film changed from the positive exchange bias field (+HEB = +6.45 Oe) at 200 K to a negative field (-HEB = -8.12 Oe) at 100 K, indicating a shift in macroscopic magnetism from antiferromagnetic to weak ferromagnetic order below 200 K. Elemental analysis via X-ray photoelectron spectroscopy revealed that the Fe ions in the BiFeO2.85 film are in a 3+ valence state, and a peak feature at 532.1 eV confirmed the presence of induced oxygen vacancies. UV visible NIR and valence band spectroscopic studies showed that the direct band-gap energy, and the separation between the valence band maximum and Fermi energy were approximately 2.27 eV and 0.9 eV, respectively, which are red-shifted when compared to its bulk form. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_02020 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Investigation of electronic energy levels in a weak ferromagnetic oxygen-deficient BiFeO2.85 thick film using absorption and X ray photoelectron spectroscopic studies Balakrishnan, Ramachandran Dixit, Ambesh Rao, Mamidanna Sri Ramachandra Materials Science We grew a 2 micron thick film of single-phase BiFeO3 on a Si (100) substrate by pulsed laser deposition with a substrate temperature of 575 oC and an oxygen partial pressure of 0.06 mbar. X ray diffraction analysis indicated that the film exhibits textured growth along the (110) plane and possesses a rhombohedral R3c structure. Investigations using scanning electron microscopy and atomic force microscopy revealed an average grain size of about 300 nm and a surface roughness of 18 nm for the film. Energy dispersive X ray analysis estimated the composition of the film to be BiFeO2.85. Temperature- and magnetic field dependent magnetization measurements demonstrated weak ferromagnetic properties in the BiFeO2.85 film, with a non-zero spontaneous magnetization at H = 0 Oe across the temperature range of 2 to 300 K. Furthermore, the exchange bias field (HEB) of the film changed from the positive exchange bias field (+HEB = +6.45 Oe) at 200 K to a negative field (-HEB = -8.12 Oe) at 100 K, indicating a shift in macroscopic magnetism from antiferromagnetic to weak ferromagnetic order below 200 K. Elemental analysis via X-ray photoelectron spectroscopy revealed that the Fe ions in the BiFeO2.85 film are in a 3+ valence state, and a peak feature at 532.1 eV confirmed the presence of induced oxygen vacancies. UV visible NIR and valence band spectroscopic studies showed that the direct band-gap energy, and the separation between the valence band maximum and Fermi energy were approximately 2.27 eV and 0.9 eV, respectively, which are red-shifted when compared to its bulk form. |
| title | Investigation of electronic energy levels in a weak ferromagnetic oxygen-deficient BiFeO2.85 thick film using absorption and X ray photoelectron spectroscopic studies |
| topic | Materials Science |
| url | https://arxiv.org/abs/2504.02020 |