Appearance of room temperature ferromagnetism in Cu-doped TiO$_{2-δ}$ films

Details Appearance of room temperature ferromagnetism in Cu-doped TiO$_{2-δ}$ films Appearance of room temperature ferromagnetism in Cu-doped TiO$_{2-δ}$ films

2005-05-24

arxiv.org/abs/cond-mat/0505602v2

Physical Review B 72, 161313 (R) (2005)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, published in Phys. Rev. B (Rapid Comm.)

Scientific paper

10.1103/PhysRevB.72.161313

In recent years there has been an intense search for room temperature ferromagnetism in doped dilute semiconductors, which have many potentially applications in spintronics and optoelectronics. We report here the unexpected observation of significant room temperature ferromagnetism in a semiconductor doped with nonmagnetic impurities, Cu-doped TiO$_2$ thin films grown by Pulsed Laser Deposition. The magnetic moment, calculated from the magnetization curves, resulted surprisingly large, about 1.5 $\mu_B$ per Cu atom. A large magnetic moment was also obtained from ab initio calculations using the supercell method for TiO$_2$ with Cu impurities, but only if an oxygen vacancy in the nearest-neighbour shell of Cu was present. This result suggests that the role of oxygen vacancies is crucial for the appearance of ferromagnetism. The calculations also predict that Cu doping favours the formation of oxygen vacancies.

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