Ooxygen vacancy in TiO2 nanoribbons cause room temperature ferromagnetism.

What is it about?

Just oxygen vacancy in TiO2 nanoribbons cause room temperature ferromagnetism, without any magnetic impurity doping. Direct evidence of oxygen vacancies and related Ti3+ in the as-prepared and vacuum annealed TiO2 samples are provided through X-ray photoelectron spectroscopy analysis. Micro-Raman, infrared absorption and optical absorption spectroscopic analyses. It is caused by the bound magnetic polarons (BMP), which include electron locally trapped by an oxygen vacancy with the trapped electron occupying an orbital overlapping with the unpaired electron (3d1) of Ti3+ ion.

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Why is it important?

Dilute magnetic semiconductors (DMS), in particular the ferromagnetic oxides, have been at the forefront of research for spintronics and magneto-optic device materials.The discovery of ferromagnetism in Co-doped TiO2 with a Curie temperature (TC) exceeding 300 K was crucial in expanding the field of DMS to oxides, leading to a rapid development of new materials and phenomena arising from a synergy of semiconductor physics and strongly correlated systems, We show that Just oxygen vacancy in TiO2 nanoribbons cause room temperature ferromagnetism, without any magnetic impurity doping. This is important for spintronic and memory device applications.

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