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Unveiling the interplay between induced native defects and room temperature magnetic ordering in titanium deficient
Jayaseelan Dhakshinamoorthy1,2, Sachin Kumar Srivastava3, Durgamadhab Mishra2
1Nanosensor Laboratory, PSG Institute of Advanced Studies, Coimbatore-641 004, India.
Investigating magnetic ordering in undoped titanium dioxide (TiO2) nanoparticles reveals that native defects, like titanium interstitials and oxygen vacancies, significantly influence magnetic properties. The arrangement and proximity of these defects dictate the overall magnetic moment in TiO2.
Area of Science:
- Materials Science
- Solid State Physics
- Nanotechnology
Background:
- The origin of magnetic ordering in undoped semiconductors with native defects remains an active research area.
- Understanding defect-induced magnetism is crucial for developing novel magnetic materials.
Purpose of the Study:
- To investigate the interplay between magnetic ordering and native defects in undoped anatase TiO2 nanoparticles.
- To elucidate the role of structural disorder and specific defects in the magnetic behavior of TiO2.
Main Methods:
- Synthesis of structurally disordered TiO2 nanoparticles via controlled atmospheric rapid cooling (quenching).
- Characterization of structural disorders using spectroscopic and microscopic analyses.
- First-principle calculations to determine the origin of magnetic ordering.
Main Results:
- Quenching process successfully synthesized TiO2 nanoparticles with high concentrations of titanium interstitials and oxygen vacancies.
- Structural analyses confirmed Ti deficiency in both pristine and quenched TiO2 nanoparticles.
- First-principle calculations showed that the magnetic moment depends on the distance between Ti interstitials and neighboring vacancies.
Conclusions:
- The magnetic ordering in titanium-deficient TiO2 is governed by the spatial arrangement of native defects.
- Excess Ti interstitials and vacancies in quenched TiO2 nanoparticles lead to reduced net magnetic moments due to anti-ferromagnetic coupling.
- Defect engineering in TiO2 offers a pathway to tune its magnetic properties.
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