Magnetic Properties of Doped Titanium Dioxide Nanostructures

Titanium dioxide (TiO₂) in its nanoscale form has long been prized for photocatalytic and electronic applications. When doped with transition-metal or rare-earth ions, TiO₂ can exhibit room-temperature ferromagnetism, transforming it into a candidate for spintronic devices and magnetic sensors. The origin of magnetic ordering in doped TiO₂ nanostructures is multifaceted: substitutional dopants such as cobalt, nickel or iron introduce local magnetic moments, while intrinsic defects—most notably oxygen vacancies—mediate exchange interactions. Crystallographic phase (anatase versus rutile), particle morphology and dopant concentration all influence the balance between ferromagnetic, paramagnetic and diamagnetic contributions. Studies reveal that careful control of synthesis parameters—such as sol-gel chemistry, sputter deposition or molten-salt processing—allows tuning of magnetic hysteresis, coercivity and saturation magnetisation. Beyond fundamental interest, these materials hold promise for magneto-optical switches, non-volatile memory and multifunctional photocatalysts in which magnetic separation simplifies recovery and reuse.

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Magnetic Properties of Doped Titanium Dioxide Nanostructures publication trend

The graph below shows the total number of articles in magnetic properties of doped titanium dioxide nanostructures across all publications each year (not limited to Nature Index journals).

Technical terms

Dopant: An impurity element introduced into a host lattice to alter its electronic or magnetic properties.

Ferromagnetism: A type of magnetic ordering in which atomic magnetic moments align parallel to each other, resulting in spontaneous magnetisation.

Paramagnetism: A form of magnetism in which unpaired electron spins weakly align with an external magnetic field but do not retain magnetisation after removal of the field.

Oxygen vacancy: A defect in an oxide lattice where an oxygen atom is missing, often acting as an electron donor and influencing magnetic behaviour.

Diluted magnetic semiconductor: A semiconductor material in which a fraction of the host atoms is replaced by magnetic ions, enabling coupling between charge carriers and localised spins.

References

1. Ferromagnetic Property of Co and Ni Doped TiO2 Nanoparticles. Journal of Nanomaterials (2015).
2. Structural, optical, and magnetic study of Ni-doped TiO2 nanoparticles synthesized by sol–gel method. International Nano Letters (2018).
3. Ferromagnetic-like behavior of Co doped TiO2 flexible thin films fabricated via co-sputtering for spintronic applications. Heliyon (2020).